X
Lost password?

Don't have an account?
Gain Access Now

X

Receive free daily analysis

NFL
NBA
NHL
NASCAR
CFB
MLB
MMA
PGA
ESPORTS
BETTING

Already have an account? Log In

X

Forgot Password


POPULAR FANTASY TOOLS

Expert Advice
Articles & Tools
Import Your Leagues
Draft Rankings
Draft Simulator
Enter League Settings
Value Picks
Compare Any Players
News and Alerts

Chris Gregory - RotoBaller

231 articles

Articles

Aaron Donald - Fantasy Football Rankings, IDP Draft Sleepers, Defense (DST)

Week 15 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

Many fantasy leagues have started their fantasy playoffs already, and most others will this week. Most of us avoid Week 18 as a matter of practice and optimize playoff seeding based on the depth of our leagues. But not all commissioners know how to maximize their playoff settings. Some commissioners are new and just don’t […]


Chris Jones Kansas City Chiefs Defense - Fantasy Football DST, Defense Streamers, Waiver Wire IDP

Week 14 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

For the select people who read the introduction to my articles, I will begin by apologizing. A severe case of COVID has limited my loquaciousness this week, meaning the one guy who prints off my articles and posts them in his work locker with hearts drawn around them will be disappointed. To you, Carl, I […]


Houston Texans Defense D/ST Streamers, Rankings, Waiver Wire - Derek Stingley Fantasy Football IDP

Week 14 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

This week could see several prominent IDP names come off of IR, further crowding position groups as we get six teams back from a bye. The instinct of many will be to grab these big names from waivers the second they are activated. Some players merit such a move, while others won’t in standard or […]


Ahmad Sauce Gardner - Fantasy Football

Week 13 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

Perspective means a lot in sports, as in many areas of life. An example of this would be Shaquille Leonard. We mention him here frequently because he remains a legend in many IDP circles. Even this year he's been a pretty productive tackler, despite limited snaps and conflicts with his team/coaching staff. So, obviously a […]


Aaron Donald - Fantasy Football Rankings, IDP Draft Sleepers, Defense (DST)

Week 13 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

Let us begin this grueling fantasy week with a moment of silence for my pre-season pick for this year’s IDP Breakout: Jaelan Phillips. While the former Hurricane was electric this weekend and showed signs of being what we thought he could in recent weeks, he struggled with injuries throughout the season before losing the rest […]


Indianapolis Colts Defense - DST Rankings, Darius Leonard, IDP Fantasy Football

Week 12 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

IDP managers have been hit with an onslaught of defender headlines as we hit mid-week of the Thanksgiving season. As of Tuesday, multiple impact fantasy defenders have been lost this week for various reasons. These aren’t minor losses, either. They are significant losses with long-term ramifications. Some of them we saw coming, and some we […]


Patriots Defense - Fantasy Football DST Rankings, Team Defense, IDP Sleepers, Devin McCourty

Week 12 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

Thanksgiving week is a time to be thankful. It's a time to be together, appreciative, and watch poorly acted and historically inaccurate 3rd grade plays. As a result, every football analyst and talking head will do a bit about what they are thankful for this week. In fact, all of us with a blog, article, […]


Raiders Defense - Fantasy Football DST, Maxx Crosby IDP, Defense Rankings

Week 11 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

Injuries in the NFL can be a tricky thing. On a purely human level, they are always bad. We don't like seeing any person get hurt. It can change their lives in innumerable ways, usually negatively. So, as human beings, we don't like to see injuries happen. However, there are occasions where injuries lead to […]


Jaguars Defense - Fantasy Football DST Rankings, Foyesade Oluokun IDP Draft Sleepers

Week 11 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

There are four NFL teams on bye in Week 11. That is usually a prescription for heavy roster turnover and triage in fantasy circles. However, this bye week is uniquely tame. While this bye is taking the NFL’s leading tackler (Zaire Franklin) away from us, the losses could be far worse. The Saints typically have […]


Ahmad Sauce Gardner - Fantasy Football

Week 10 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

We are entering that fantasy phase where some teams must plan for next year. Some squads have been hit with injuries, others bad luck. Whatever the reason, hundreds of managers in long-term keeper or dynasty leagues have a 2-7 or 3-6 record. This leaves you with little hope of contention and the startling reality of […]


Jaguars Defense - Fantasy Football DST, Defense Streamers, Waiver Wire IDP

Week 10 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

I'll begin with a disclaimer: I know this article is about defense and IDP rankings. Arthur Smith is obviously an offensive-minded coach whose decisions/mistakes largely impact offensive players. That said, we are all fantasy football fans, and Smith routinely does or says things that put him in the crosshairs of fantasy and regular football fans […]


Chase Young Washington Commanders Defense - Fantasy Football DST Streamers, Rankings, Pickups

Week 9 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

The NFL's trade deadline was again a noteworthy affair, which is thankfully becoming a regular occurrence. While the offensive moves at the deadline were limited, there were several major moves on the defensive side of the ball. That's music to many IDP managers' ears. For fantasy purposes, we saw four trades that likely impacted IDP […]


Indianapolis Colts Defense - DST Rankings, Darius Leonard, IDP Fantasy Football

Week 9 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

Am I the only one who feels the number of noteworthy injuries in the NFL is increasing despite almost every rule being geared toward player safety? The data and reports are mixed on this subject, but the optics are there. For example, the NFL reports that concussions have steadily declined since 2015, but CBS reported […]


Aaron Donald - Fantasy Football Rankings, IDP Draft Sleepers, Defense (DST)

Week 8 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

The NFL's trade deadline is fast approaching, and that is finally starting to mean something. After a near century of stagnant deadline behavior from NFL teams, we are starting to see contenders make a mid-season push with trades. It's a refreshing change of pace, even if it often results in a waste of money and […]


Jessie Bates Atlanta Falcons Defense - Fantasy Football DST, Defense Streamers, Waiver Wire IDP

Week 8 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

It's Week 8, and it’s a bit of a unicorn because… there are no teams on bye! Now, I know what you're asking. If there is this perfectly good week sitting right in the middle of the schedule where no teams are off, why on earth were there teams on bye in Weeks 5 and […]


Chris Jones Kansas City Chiefs Defense - Fantasy Football DST, Defense Streamers, Waiver Wire IDP

Week 7 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

As we enter Week 7 of the NFL season, we are nearing the mid-point of the fantasy sleight. Thus, now is a good time to take stock of the IDP waiver landscape. Specifically, what players are woefully under-rostered in IDP leagues. To do this, we will remember that some teams have already had bye weeks, […]


49ers Defense D/ST Streamers, Rankings, Waiver Wire - Nick Bosa Fantasy Football IDP

Week 7 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

Time flies when you’re having fun, allegedly. Perhaps that’s also occasionally true when you are not having fun, though. How else could one explain how quickly it seems we've reached Week 7 of the NFL season despite countless injuries that only continued to pile up in Week 6? In the past two weeks alone, we've […]


Jaguars Defense - Fantasy Football DST, Defense Streamers, Waiver Wire IDP

Week 6 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

In this week’s IDP rankings article, I lampooned Arthur Smith as an offensive coach who can’t score points and gets bailed out by his defense and soft schedule. Today, I'd like to touch on another offensive coach who some are giving too much credit this week. That coach is Nathaniel Hackett. While the Jets rightly […]


Week 6 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

If you’ll indulge me, I’d like to begin this week by returning to a favorite topic of mine: Arthur Smith. The former Titans’ coordinator has been a whipping post of mine for some time, but he’s earned praise from some analysts as a “gamer” who wins despite his offense (his specialty) struggling to score touchdowns. […]


Week 5 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

As we enter Week 5 and the first round of byes, it is a good time to take stock of what IDP managers could be doing better. After all, we are here to advise the masses, aren't we? One way to help IDP managers improve, especially in shallow formats, is to consider the problems with […]


Ravens Defense - Fantasy Football DST Rankings, Draft Sleepers, IDP Targets

Week 5 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

It's Week 5 in the NFL, which means the first round of byes is here. That brings questions for all of us. Chief among those questions is, "Why does any NFL team need a bye this early in the season?" It's a valid question, especially since the NFL added an extra game in 2021. Odds […]


MIles Garrett - Fantasy Football Defense Rankings, D/ST Streamers, Waiver Wire, IDP Pickups

Week 4 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

Week 3 was a nice recovery from the sleight before it, where my risers and fades had more misses than not. Of course, any streamer recommendations are aimed at little-rostered or seldom-started players, so those calls will always have hits and misses. That is the nature of elevating waiver options and fading regular starters. However, […]


Ahmad Sauce Gardner - Fantasy Football

Week 4 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

Entering this season, IDP managers faced a down year in individual defensive player rankings. Specifically, it was a season without a clear and unquestioned top-overall defender who should be drafted before all others. Shaquille Leonard was once this type of fantasy defender, but he lost that crown to injury and competition on his own team. […]


Broncos Defense - Fantasy Football DST Rankings, IDP Sleepers, NFL Team Defenses

Week 3 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

There is one thing that new IDP managers should remember as in-season moves and injuries start to rack up. That is defensive news travels slower than offensive news does. Just think about how many alerts you got when Kareem Hunt signed, or Cam Akers was traded. These running backs couldn't find a field last week, […]


Week 3 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

While Week 2 was rough for some of my streamer picks, it ultimately served as a reminder of how unreliable metrics can be year-to-year. As I’ve said before, coaching staff and offensive line changes happen every season, and the smallest move can change everything. If a team loses one guard, the whole line can suffer. […]


Ahmad Sauce Gardner - Fantasy Football

Week 2 IDP Start Em, Sit Em - Streamers and Fades for Fantasy Football Defensive Players

With a week under our belts, injuries are already taking hold of fantasy and NFL teams. Aaron Rodgers is the most obvious name on that list, but several IDP-relevant players also came up limping in Week 1. The most concerning defender on the injury list is Jalen Pitre, our second-ranked DB entering the season. Pitre […]


Indianapolis Colts Defense - DST Rankings, Darius Leonard, IDP Fantasy Football

Week 2 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

Week 1 of the NFL season is under our belts. The opening weekend had its usual share of surprises, such as Puka Nakua exceeding our wildest expectations. It also had its fair share of unsurprising outcomes, as some players and teams met our expectations to a T. For example, as we expected, Chris Jones missed […]


MIles Garrett - Fantasy Football Defense Rankings, D/ST Streamers, Waiver Wire, IDP Pickups

Week 1 IDP Rankings for Fantasy Football - Positional Rankings for Linebacker, Defensive Line, Defensive Back

The NFL season starts in less than a week, which is an exciting time for most. However, the beginning of the year can be nerve-wracking if you rostered injured superstars like Cooper Kupp or Jonathan Taylor. IDP fans may have it even worse. Nick Bosa and Chris Jones managers don't just worry about whether their […]


Aaron Donald - Fantasy Football Rankings, IDP Draft Sleepers, Defense (DST)

IDP Positional Rankings for 2023 Fantasy Football Drafts - Linebacker, Defensive Line, Defensive Back (Individual Defensive Players)

With the 2023 NFL season just a couple of weeks away, now is a fine time to renew my IDP positional rankings series. Every year, I will designate the top players at each defensive position in fantasy football and give you weekly analysis based on their matchups. We will do the same here but with […]


MIles Garrett - Fantasy Football Defense Rankings, D/ST Streamers, Waiver Wire, IDP Pickups

IDP Fantasy Football Mock Draft: One-Man Mock for Individual Defensive Players

Odds are you’ve heard fantasy football analysts refer to their “home leagues” before, but many don’t know what that means. Home leagues are your oldest fantasy leagues with your best friends, or leagues that you join to bond with coworkers. They include all kinds of personalities and skill levels, and they will always have head-scratching […]


Page 3 of 8123456...

POPULAR FANTASY TOOLS

Expert Advice
Articles & Tools
Import Your Leagues
Draft Rankings
Draft Simulator
Enter League Settings
Value Picks
Compare Any Players
News and Alerts

REAL-TIME FANTASY NEWS

Jonathan Aranda14 mins ago

Slugs Second Home Run Of The Season
Vinnie Pasquantino21 mins ago

Homers In Royals' Defeat
Lauri Markkanen23 mins ago

Sidelined For Sunday's Season Finale
Jackson Jobe29 mins ago

Gets First Career Win
Isaiah Collier34 mins ago

Unavailable For Season Finale
Luis L. Ortiz36 mins ago

Earns First Win With Career-High 10 Strikeouts
Elly De La Cruz44 mins ago

Grand Slam Powers Reds To 5-1 Win
Pascal Siakam50 mins ago

Out Versus Cleveland
Tyrese Haliburton51 mins ago

Remains Out On Sunday
Derrick White56 mins ago

Out For The Season Finale
Kristaps Porzingis57 mins ago

Out Versus Charlotte
Jaylen Brown1 hour ago

Jayson Tatum Resting On Sunday
Jaylen Brown1 hour ago

Receiving Treatment On His Right Knee
Lance McCullers Jr.1 hour ago

Tosses Four Shutout Innings In Rehab Start
Brandon Woodruff1 hour ago

Strikes Out Five During Rehab Start
Richard Fitts1 hour ago

Exits Due To Shoulder Injury
Shohei Ohtani1 hour ago

Throws 30-Pitch Bullpen Session
Colin Rea1 hour ago

Likely To Start On Sunday
Jonathan India2 hours ago

Removed Early On Saturday
Zane Smith2 hours ago

Is A Sneaky Pick Once Again At Bristol
John Hunter Nemechek2 hours ago

Has Upside At Bristol This Weekend
Todd Gilliland2 hours ago

May Struggle At Bristol, But You Shouldn't Avoid Him In Fantasy
Ty Dillon3 hours ago

Is Ty Dillon Unplayable In DFS At Bristol This Weekend?
Jesse Love3 hours ago

Qualifies 19th For Cup Series Debut At Bristol
Brady Tkachuk4 hours ago

Ruled Out For Sunday
Jose Siri4 hours ago

Exits Early On Saturday
Connor Hellebuyck4 hours ago

Faces Blackhawks Saturday
Joey Bart4 hours ago

Out Of The Lineup On Saturday
Anthony Stolarz4 hours ago

Starts Against Canadiens
Tyler Freeman4 hours ago

Scratched From Saturday's Lineup
Brendan Rodgers4 hours ago

Remains Out On Saturday
Casey DeSmith4 hours ago

In Stars Crease Saturday
Will Smith4 hours ago

Sitting Out On Saturday
John Marino4 hours ago

Remains Sidelined Saturday
Oneil Cruz4 hours ago

To Miss Third Straight Game
Brenton Doyle5 hours ago

Resting For Second Straight Game
Thatcher Demko5 hours ago

Battling An Illness
Oliver Ekman-Larsson5 hours ago

Out On Saturday
Alec Martinez5 hours ago

Returns To Action Against Winnipeg
Philip Broberg5 hours ago

Misses Saturday's Contest
Alex Pietrangelo5 hours ago

Unavailable Versus Predators
Jack Eichel5 hours ago

Sits Out Third Straight Game
Sam Reinhart6 hours ago

Won't Play Against Sabres
Aleksander Barkov6 hours ago

Resting On Saturday
Paolo Banchero7 hours ago

Could Miss Sunday's Finale
Bobby Portis7 hours ago

Taking Sunday Off
Kyle Kuzma7 hours ago

Probable For Season Finale
Brook Lopez8 hours ago

Resting On Sunday
Giannis Antetokounmpo8 hours ago

Not Expected To Play On Sunday
Pete Crow-Armstrong8 hours ago

In Contract Talks With Cubs
Marcus Stroman8 hours ago

Placed On 15-Day Injured List
Andrew Abbott8 hours ago

Officially Activated Off Injured List
Dustin Wolf13 hours ago

Earns Victory On Friday
Evan Bouchard13 hours ago

Tallies Two Points In Victory
Connor McDavid13 hours ago

Busy On Friday
Sidney Crosby14 hours ago

Nets Goal, Assist In Victory
Marco Kasper14 hours ago

Leads The Way On Friday
Shane Pinto14 hours ago

Strikes Twice On Friday
Arizona Cardinals1 day ago

Patrick Peterson Retiring
1 day ago

Tyler Shough Visits With Saints On Friday
Derek Carr1 day ago

Could Miss Start Of Season With Shoulder Injury
Jalen Brunson1 day ago

Available For Friday's Matchup With Cleveland
OG Anunoby1 day ago

Josh Hart Will Play On Friday
Darius Garland1 day ago

Likely To Suit Up Friday
Karl-Anthony Towns1 day ago

Ruled Out Versus Cleveland
De'Andre Hunter1 day ago

Out Of Action Against Knicks
Sam Merrill1 day ago

Sidelined For Friday
Pascal Siakam1 day ago

Won't Play Against Orlando
Morgan Frost1 day ago

Good To Go Against Wild
Myles Turner1 day ago

Ruled Out On Friday
MIN1 day ago

Jake Middleton A Game-Time Call Friday
Cleveland Browns1 day ago

Rayshawn Jenkins Visiting With Browns
1 day ago

TreVeyon Henderson Completes Top-30 Visits
Andrei Iosivas1 day ago

Adds Muscle This Offseason
Drew Lock1 day ago

Returning To Seattle
Diego Lopes1 day ago

Can Become New UFC Featherweight Champion
Alexander Volkanovski1 day ago

Looks To Reclaim Featherweight Title
Paddy Pimblett1 day ago

Looks To Remain Undefeated In The UFC
Michael Chandler1 day ago

Set For Co-Main Event
MMA1 day ago

Patricio Freire Set For His UFC Debut
Yair Rodriguez1 day ago

Looks To Get Back In The Win Column
Jean Silva1 day ago

A Favorite At UFC 314
Bryce Mitchell1 day ago

Looks To Win Back-To-Back Fights
Dominick Reyes1 day ago

Set To Open Up UFC 314 Main Card
Nikita Krylov1 day ago

Looks For His Fourth Win In A Row
Kansas City Chiefs1 day ago

Chiefs Officially Re-Sign Jack Cochrane
Indianapolis Colts1 day ago

Tight End An Obvious Early Target For The Colts In The Draft
Miami Dolphins1 day ago

Patrick Paul Set To Take Over At Left Tackle
San Francisco 49ers1 day ago

Defensive Line A Glaring Need For 49ers Heading Into The Draft
Aidan O'Connell1 day ago

Raiders Could Trade Aidan O'Connell On Draft Weekend
Mo Alie-Cox1 day ago

Remaining With Colts
Josh Johnson2 days ago

Joins Commanders
Houston Texans2 days ago

Jalen Pitre Signs Three-Year Extension
Joe Flacco2 days ago

Heading Back To Cleveland
Chicago Bears2 days ago

Bears Could Go With Left Tackle With Pick No. 10
New York Jets2 days ago

Jets Expected To Go With Offensive Player With Their First Pick
Las Vegas Raiders2 days ago

Raiders Could Target Cornerback If They Trade Back
Jacksonville Jaguars2 days ago

Jaguars Targeting Mason Graham At No. 5 Overall?
New England Patriots2 days ago

Armand Membou Could Be In Play For Patriots At No. 4
Maverick McNealy3 days ago

Looking For Success At Masters Debut
Tony Finau3 days ago

Looks To Stay Consistent At Augusta
Thomas Detry3 days ago

A Shaky Play At Augusta
Sam Burns3 days ago

Not In Good Form Ahead Of Masters
Will Zalatoris3 days ago

Looks To Continue Great History At Augusta
Rory McIlroy4 days ago

2025 Is The Best Chance For Rory McIlroy To Complete Career Grand Slam
Joaquin Niemann4 days ago

Brings Strong Form Into Augusta
Scottie Scheffler4 days ago

Aims For Historic Third Green Jacket At Augusta
Jon Rahm4 days ago

A Strong Contender At Augusta
Hideki Matsuyama4 days ago

Aiming For Another Green Jacket At Augusta
Michael Kim4 days ago

Aims To Build On Strong Season At Augusta
PGA4 days ago

Victor Hovland A Solid Value Play At Augusta
Brian Harman4 days ago

A Risky Play At Augusta Despite Win At Valero
Matt Fitzpatrick4 days ago

A Volatile Play At The Masters
Bryson DeChambeau4 days ago

Looking To Translate LIV Success To Augusta
Xander Schauffele4 days ago

In A Questionably Optimistic Spot Ahead Of Augusta
Jordan Spieth4 days ago

Will Be An Interesting Commodity At Augusta
Sepp Straka4 days ago

Looking Solid Ahead Of Masters
Russell Henley4 days ago

Deserves Consideration At Augusta
Billy Horschel4 days ago

Boom Or Bust Heading Into Masters
Phil Mickelson4 days ago

Hopes To Roll Back The Clock At Augusta National
Lerone Murphy5 days ago

Remains Undefeated
Josh Emmett5 days ago

Falls Short At UFC Vegas 105
Joanderson Brito5 days ago

Gets Outclassed At UFC Vegas 105
Pat Sabatini5 days ago

Beats Joanderson Brito By Unanimous Decision
Cortavious Romious5 days ago

Still Winless In The UFC
ChangHo Lee5 days ago

Gets TKO Win At UFC Vegas 105
Gerald Meerschaert5 days ago

Drops Decision At UFC Vegas 105
Brad Tavares5 days ago

Gets Decision Win At UFC Vegas 105
Luis Gurule5 days ago

Suffers His First Loss
Ode' Osbourne5 days ago

Gets Back In The Win Column
Robert Valentin5 days ago

Dominated At UFC Vegas 105
Denny Hamlin5 days ago

Has Luck On His Side This Time, Snatches Win At Darlington
Ryan Blaney5 days ago

Misses Out On Victory At Darlington
Tyler Reddick5 days ago

Gains A Top-Five Finish And Falls Short Of Winning Darlington
Chase Elliott5 days ago

Quietly Earns His Fifth Top-10 Finish Of 2025 At Darlington
Ty Gibbs5 days ago

Ends His Slump With First Top-10 Finish Since September 2024 At Darlington
Chris Buescher6 days ago

Consistency Continues With Sixth-Place Finish At Darlington
William Byron6 days ago

Attempt To Lead From Start To Finish Cost Him Darlington Race
Christopher Bell6 days ago

Struggles At Darlington Until Being Bailed Out By Pit Strategy
Kyle Larson6 days ago

Bookends Darlington Race With Crashes
Ross Chastain6 days ago

Recovers From Untimely Pit Stop To Finish Seventh
RANKINGS
C
1B
2B
3B
SS
OF
SP
RP

RANKINGS

QB
RB
WR
TE
K
DEF