👉 TAP TO SAVE 30% WITH CODE NEW
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

#1 Expert Projections
Save 30% Now
Import Your Leagues
Top-Rated Accuracy
Draft Simulator
Enter League Settings
Compare Any Players
Rookies & Call-Ups
24x7 News and Alerts

Who Should I Start? Fantasy Baseball Start/Sit Decisions for Matt Olson, Rafael Devers, Jasson Dominguez, Ronny Mauricio, more

matt olson fantasy baseball rankings draft sleepers mlb injury news

Quickly get start 'em sit 'em advice for Who Should I Start fantasy baseball lineup questions from 9/4 - 9/10 (2023). Connelly tells you who to start and sit.

Welcome RotoBallers to my fantasy baseball start/sit article for the week ahead, September 4 - September 10. This week's article will focus on Jasson Dominguez, Ronny Mauricio, Jack Flaherty, Michael Kopech, Jake Fraley, Lars Nootbaar, Matt Olson, and Rafael Devers.

Whether you are prepping to set your weekly lineups or determining who to play in a pivotal daily matchup, choosing who to start vs. sit is one of the most nerve-racking and potentially frustrating aspects of fantasy baseball. Fortunately, there is a free solution available at RotoBaller. The Who Should I Start Tool allows you to quickly compare any two players and receive fantasy projections for today, tomorrow, or the current week.

The tool provides rankings, projections, recent news, and schedules side-by-side to aid in your decision-making. The tool defaults to ESPN scoring, but the Premium version within Team Sync will automatically use your league's scoring and roster settings when making recommendations. Each week, I will use the tool to review a few interesting start/sit comparisons for the final day of the period and preview the following week. Hopefully, this series will help both daily fantasy managers end their weeks strong and also get them comfortable with routinely using the tool during the week to make tough roster decisions. Let's get into some start vs. sit comparisons for the week ahead, September 4 - September 10!

Be sure to check all of our fantasy baseball draft tools and resources:

 

Crosstown Call-Ups

Jasson Dominguez (OF) vs. Ronny Mauricio (SS)

Our first comparison is between two highly-touted prospects who have recently been called up for New York teams. Jasson Dominguez hadn't played much at Triple-A Scranton/Wilkes-Barre but had an impressive .419/.514/.581 slash line. Ronny Marucio had shown power and speed all season long with Triple-A Syracuse, slashing .292/.346/.506 with 23 home runs and 24 stolen bases. Which player is more worth a roster spot down the stretch?

Both players are actually too new to be in the tool, but both will face tougher matchups on Sunday. The Mets will face a tougher matchup against George Kirby, while the Yankees will be at the scuffling Cristian Javier. As such, Dominguez gets the edge for Sunday.

Looking ahead to Week 24, both teams will draw a favorable slate. The Yankees will play three games against the Tigers and three against the Brewers, while the Mets will play two at the Nationals and three at the Twins. Both are scheduled to face three lefties.

Mauricio has hit lefties much better than Dominguez throughout their time in the farm systems. The Yankees do get one more game, but Dominguez's playing time may be limited this week due to the lefty-heavy schedule. Both players offer intriguing power and speed fantasy upside, but Mauricio gets the nod for the following week.

 

Desperate Streamers

Jack Flaherty vs. Michael Kopech

Our next comparison is between two starters whom fantasy managers may be forced to stream in a last effort to earn a playoff berth. Jack Flaherty has been mostly underwhelming since joining the Orioles, posting a 6.41 ERA and 24.4% strikeout rate in four starts. Michael Kopech has been very inconsistent this season with a 5.08 ERA and a 22.8% strikeout rate in 25 starts. Which one is the less-risky bet?

RotoBaller gives Flaherty a slight recommendation for Sunday. Kopech draws the better matchup, as he does have the projection edge in strikeouts. Flaherty has a better chance for a win and is expected to pitch longer into the game with a slightly better ERA and WHIP.

Flaherty is slated for a tough matchup next week at the Red Sox, while Kopech will face the Tigers again on the road. Both players are again only desperate shots in the dark, but Flaherty does now play on a much better team than Kopech and has sprinkled in strong starts throughout the season. Walks and home runs have truly been crippling for Kopech. While walks have been an issue for Flaherty as well, they haven't been nearly as bad.

While I would not recommend either player unless truly necessary, I do think that Flaherty has a better chance of turning in a decent start for fantasy managers than Kopech.

 

Recently-Returning Outfielders

Jake Fraley vs. Lars Nootbaar

This comparison is between two solid outfielders who have recently returned from the injured list. Jake Fraley has been an overall fantasy contributor this season with a .269/.349/.476 slash line, 15 HR, 63 RBI, and 20 steals. Lars Nootbaar has also helped in all facets, slashing .279/.380/.447 with 12 HR, 39 RBI, and eight stolen bases. Which of these players should fantasy managers slot back into their lineups?

Fraley receives a slight recommendation for Sunday. Both will face decent matchups but Fraley draws the better one. Ultimately, Fraley's high projected batting average, slugging percentage, and stolen bases give him the edge. But both are solid choices in points leagues.

The Reds will have a six-game homestand the following week with three games against the Mariners and three against the Cardinals. The Cardinals will play three games at the Braves before heading to Cincinnati. The Reds are scheduled to face two lefties while the Cardinals will face three.

Both players have hit righties better, but Fraley has really struggled against lefties with a .147 batting average. Despite this, Fraley offers more value in roto leagues given his higher HR and SB counts, which also carries over into points leagues. This and the better matchups give the edge to Fraley for the following week.

 

Slumping Sluggers

Matt Olson (1B) vs. Rafael Devers (3B)

Our final comparison is between two top fantasy players who have really disappointed lately. Matt Olson managed a mere .357 slugging percentage with no HR over the final two weeks of August, while Rafael Devers wasn't much better with a .356 slugging percentage and one HR. Fantasy managers will likely feel compelled to start both, but which one has the better chance to pick it up for the fantasy playoffs?

RotoBaller gives Olson a slight recommendation for Sunday despite drawing the tougher matchup. Olson's higher slugging projection seems to be the deciding factor, but Devers has higher projections in batting average. Given the recent lack of power from both, I would probably lean toward Devers.

The Braves have a great slate the following week with three games against the Cardinals and three against the Pirates. On the other hand, the Red Sox will face three at the Rays and three against the O's. The Braves will face two lefties and the Red Sox will face one, which doesn't really impact either player.

Both players have been slumping recently, so the decision ultimately comes down to the matchups. In this case, the Braves have some of the best matchups of the week, making Olson my pick.



Download Our Free News & Alerts Mobile App

Like what you see? Download our updated fantasy baseball app for iPhone and Android with 24x7 player news, injury alerts, sleepers, prospects & more. All free!



More Fantasy Baseball Analysis




POPULAR FANTASY TOOLS

#1 Expert Projections
Save 30% Now
Import Your Leagues
Top-Rated Accuracy
Draft Simulator
Enter League Settings
Compare Any Players
Rookies & Call-Ups
24x7 News and Alerts

REAL-TIME FANTASY NEWS

Quentin Grimes

Could Miss Another Game
Andrew Nembhard

Probable for Wednesday
Luke Kornet

Unavailable for Wednesday
Aaron Nesmith

Likely Available Wednesday
Pascal Siakam

Expected to Play Against Lakers
Igor Chernyshov

Returns to Sharks Lineup
Dylan Larkin

Good to Go Tuesday
De'Aaron Fox

Slated to Miss Wednesday's Matchup With Memphis
Ross Colton

Logan O'Connor, Ross Colton Available Tuesday
Jalen Johnson

Could Miss Third Straight Game
PHI

Sean Couturier Returns From Two-Game Absence
Joel Embiid

Questionable Against Bulls
Morgan Rielly

Back in Action Tuesday
Joel Eriksson Ek

Kirill Kaprizov, Joel Eriksson Ek Returning Tuesday
Kon Knueppel

Active Against Kings
Thomas Chabot

to Be "Out a While"
Pat Connaughton

Sidelined on Tuesday
Evgeni Malkin

Out Against Avalanche Tuesday
Joe Flacco

Reaches Agreement to Return to Bengals
Marvin Mims Jr.

Now a Trade Candidate in Denver?
Moses Moody

Sidelined for Remainder of Season
Stephen Curry

Won't Return on Wednesday
Anthony Edwards

Limited to Individual Work
Francisco Lindor

Likely to be Ready for Opening Day
Killian Hayes

Ruled Out Tuesday Against Charlotte
Precious Achiuwa

Will Not Play Tuesday
Chicago Bulls

Coach Billy Donovan Stepping Away From the Bulls at the End of the Season?
Ryan Gerard

Can Continue Rolling at Texas Children's Houston Open
Pierceson Coody

Bounces Back at Valspar Championship
Rasmus Hojgaard

Trying to Get Back on Track at Texas Children's Houston Open
Michael Thorbjornsen

Playing Well Heading to Texas Children's Houston Open
Harry Hall

Looking for Consistency at Texas Children's Houston Open
Brooks Koepka

Continues Building Momentum
Odell Beckham Jr.

Plans to Play in 2026
RJ Harvey

Ready for a Year 2 Jump?
Baker Mayfield

Buccaneers Expected to Discuss Extension With Baker Mayfield This Offseason
Brian Robinson Jr.

Falcons to Sign Brian Robinson Jr.
Joey Bosa

a Good Fit for the 49ers?
Lavonte David

Hanging Up his Cleats
Maxx Crosby

Dealing With Degenerative Knee Condition?
Roki Sasaki

to Stick in Rotation Despite Spring Struggles
Kevin McGonigle

Makes Tigers Opening Day Roster
Scottie Scheffler

Withdraws From Texas Children's Houston Open
James Reimer

Picks Up Victory Against Rangers
San Francisco 49ers

Denzel Boston Visiting With 49ers on Tuesday
Matthew Stafford

a Great Option for Those in Win-Now Mode
Breece Hall

Dynasty Ceiling Capped in New York?
Jaylen Waddle

Restructures his Contract With Broncos
Ryan Pepiot

Placed on Injured List to Open the Season
Trevor Siemian

Signing With the Falcons
J.J. Wetherholt

JJ Wetherholt Likely to Hit Leadoff on Opening Day
Connelly Early

to Make First Start on Sunday
Tucker Kraft

a Post-Injury Buy-Low Candidate
Jakobi Meyers

Vying for Top Spot in Jacksonville Receiver Room
Jayden Higgins

Faces Obstacles in Second Season
Sam LaPorta

New Offensive Philosophy Could Help Sam LaPorta Get Back into Top Tier
Jaylon Tyson

Unavailable Against Magic
Noah Gray

Remains Buried on Kansas City Depth Chart
Jarrett Allen

Still Out Tuesday
Anthony Black

Remains Out Tuesday
Jalen Suggs

to Miss Second Consecutive Game
Luke Clanton

Might Have a Problem in Houston
Sam Stevens

Happy to See Houston This Week
Keith Mitchell

Tries to Rebound After The Players Championship
Will Zalatoris

Returning This Week at Houston
Wyndham Clark

Trending in the Wrong Direction Heading to Houston
Shane Lowry

Seeking Better Luck in Houston This Weekend
Kurt Kitayama

Poised to Bounce Back at the Houston Open
Jake Knapp

More Suited for a Course Like the Houston Open
Tony Finau

Continues Playing Well Heading to Texas Children's Houston Open
Scottie Scheffler

Returns to Action for Texas Children's Houston Open
Sam Burns

Looks to Carry Momentum Into Houston
Pete Crow-Armstrong

Cubs, Pete Crow-Armstrong Finalizing Long-Term Extension
Shane Pinto

Opens Scoring Versus Rangers
Sahith Theegala

to Rebound at Texas Children's Houston Open
Stephan Jaeger

Hopes to Jumpstart Season at Texas Children's Houston Open
Adam Scott

Hopes to Get Back on Track in Houston
Blake Snell

Targeting a May Return
Hunter Greene

Reds Place Hunter Greene on 60-Day Injured List
Blake Whiteheart

Returns to the Browns
J.J. Wetherholt

JJ Wetherholt Makes Cardinals Opening Day Roster
NFL

Ty Simpson Expected to be a First-Round Pick
Nick Pivetta

to Start on Opening Day for Padres
Brandon Woodruff

Makes Brewers Opening Day Rotation
Zack Wheeler

to Start Rehab Assignment on Saturday
Carson Benge

Makes Mets Opening Day Roster
Seiya Suzuki

to Start the Season on the Injured List
Lerone Murphy

Suffers His First Loss
Dennis Santana

Won't be Pirates' Primary Closer
Movsar Evloev

Edges Out Lerone Murphy
CFB

Notre Dame Ranks No. 1 in Returning Production for 2026
Michael Aswell

Jr. Drops Decision At UFC London
Michael Aswell

Luke Riley Outclasses Michael Aswell Jr.
Sam Patterson

Suffers Unanimous-Decision Loss
Michael Page

Wins Lackluster Decision
Austen Lane

Suffers First-Round TKO Loss
Spencer Strider

to Start the Season on Injured List
Iwo Baraniewski

Delivers 28-Second TKO
Lawson Crouse

Picks Up Three Points in Overtime Win
Filip Forsberg

Takes Predators Past Blackhawks
Alex Ovechkin

Scores 1,000th Career Goal
Nate Schmidt

Exits Early Due to Illness
Matt Grzelcyk

to Miss Four-Game Road Trip
Mikko Rantanen

to Return to Full Practice
A.J. Greer

Handed a Three-Game Suspension
Troy Terry

Wins it for Anahiem
Tyler Reddick

Overcomes Adversity for Fourth Victory of the Season At Darlington
Brad Keselowski

Falls Short of Darlington Victory Despite Domination
Ryan Blaney

Recovers From Pit-Road Struggles to Score Career-Best Darlington Finish
Carson Hocevar

Rallies to Finish Fourth at Darlington
Kyle Larson

Decent Performance Ends with Technical Issues At Darlington
Ilya Sorokin

Earns Shutout Over Columbus
Ethen Frank

Sustains Lower-Body Injury Sunday
Grayson Rodriguez

to Open Season on Injured List
Brett Pesce

Questionable to Return This Season
Stefan Noesen

Done for the Season
Mike Trout

Returns on Sunday
Nick Lodolo

Exits Early With a Blister
Jeremy Peña

Astros Not Ruling Out Jeremy Pena for Opening Day
Tyler Reddick

the Clear Favorite at Darlington
Kyle Larson

a High-Risk, High-Reward Driver at Darlington
Ryan Blaney

Is Getting Better at Darlington
NASCAR

Bubba Wallace Not Slowing Down at Darlington
Chris Buescher

Should be a Top-10 Contender at Darlington
Austin Cindric

a Sleeper at Darlington
Erik Jones

Quickest in Practice at Darlington
Denny Hamlin

Qualifies Ninth for this Week's Cup Race at Darlington
Chase Briscoe

Is One of the Top DFS Options of the Week for Darlington
William Byron

Is William Byron A Playable DFS Option for Darlington Lineups?
Christopher Bell

Could Christopher Bell be Considered A Decent DFS Option for Darlington?
Chase Elliott

Is Chase Elliott Worth Rostering At Darlington This Week For DFS?
Joey Logano

May Not Have the Speed to Warrant A Darlington DFS Lineup Spot
Ross Chastain

Should DFS Players Trust Ross Chastain at Darlington?
Kyle Busch

Could Kyle Busch Be A Worthy DFS Option for Darlington?
Brad Keselowski

May be A Contriarian DFS Tournament Option At Darlington
Lerone Murphy

Set For UFC London Main Event
Movsar Evloev

Looks To Remain Unbeaten
Michael Aswell

Jr. An Underdog At UFC London
Luke Riley

Set For UFC London Co-Main Event
Sam Patterson

Looks To Extend His Win Streak
Michael Page

Set For Welterweight Bout
Austen Lane

In Dire Need Of Victory
Iwo Baraniewski

A Favorite At UFC London
RANKINGS
C
1B
2B
3B
SS
OF
SP
RP

RANKINGS

QB
RB
WR
TE
K
DEF