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
Daily Stats & Leaders
All Pitcher Matchups
Compare Any Players
Compare Any Players
Rookies & Call-Ups
24x7 News and Alerts

Dynasty Fantasy Baseball Risers, Fallers, and Buys/Sells - Chris Clegg's Outlooks for Week 9

Hunter Brown - Fantasy Baseball Rankings, Draft Sleepers, MLB Injury News

Chris Clegg's dynasty fantasy baseball buy lows, sell highs, and MLB news for Week 9 (2025). Notable prospects debuts and dynasty risers/fallers including..

Welcome back, RotoBallers, to my dynasty fantasy baseball risers, fallers, and buys/sells for Week 9 of the 2025 MLB season. As May comes to a close, sample sizes have begun to stabilize, and there is less noise in the samples. Prospects are getting the call to majors, and there is plenty to discuss.

Today's dynasty article will look at recent prospect call-ups like Marcelo Mayer, Dalton Rushing, and Alejandro Osuna, along with several other dynasty-related news items. This bi-weekly series will examine various prospects and dynasty news and discuss fantasy implications. If you enjoy dynasty baseball, you know it is a fast-paced game. Keeping up with current events can help you stay ahead of your league mates.

Call-ups, trends, and buying and selling players are all just small pieces to help you stay ahead. So, that's what we will do in this article each week: break down everything you need to know to be successful in dynasty. At the end of the day, we all want to build a dynasty team that sustains and lasts for the long haul. I am here to help you do so. So, what do you need to know for dynasty leagues in Week 9 of the 2025 season? Let's dive in.

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

 

Recent MLB Prospect Call-Ups

Marcelo Mayer got the call to join the Red Sox, but had to be driven to the stadium because he had lost his car keys. Apparently, his car has sat at Polar Park for over two weeks due to the lost keys.

A fun side note, but what does Mayer bring to the table? He has a strong frame for a shortstop with smooth actions in the field. At the plate, he shows a simple setup and a direct path to the ball with a solid feel for the barrel. His quick hands help generate plenty of bat speed, which has taken steps forward each season.

For a third straight season, his power progressed. Mayer’s 90th percentile exit velocity jumped to 106.5 mph, and he maxed out at 115 last year. Launch angles have taken a big step forward this year, allowing him to get to more home run power. Mayer had nine home runs in Triple-A in 193 plate appearances.

The contact skills also took a big leap this year. His in-zone contact rate jumped to 87 percent, and the overall contact rate rose to 77 percent. The approach is good, and Mayer seems primed to be successful in his MLB debut. The biggest question is how he will fare against good breaking balls.

Dalton Rushing has hit and hit some more since being drafted by the Dodgers in the second round of the 2022 draft. Before his call-up to join the Dodgers in Los Angeles, Rushing owned a career minor league slash line of .277/.412/.519 with 54 home runs and 55 doubles in 1,149 plate appearances.

In 2025, Rushing spent the season in Triple-A, where he put together a slash of .308/.424/.514 with five home runs in 132 plate appearances. While he has played inconsistently in the majors, he has shown the ability to hit the ball quite hard.

It is the combination of skills that makes Rushing one of the most well-rounded hitting prospects in baseball. He makes contact, rarely chases, hits the ball hard, and hits it at ideal angles. The barrel rates are elite for Rushing, thanks to a 90th percentile exit velocity of 106 mph, which already puts him in the plus territory of MLB hitters.

Considering the low ground-ball rates, Rushing put the ball in the air over 60 percent of the time, leading to ideal launch angles and many barrels.

The contact skills with Rushing are also impressive. With an overall mark north of 79 percent, the number jumps north of 85 percent in-zone. He knows the strike zone well and picks up spin. He chased less than 18 percent of the time out of the zone. Inconsistent playing time in Los Angeles is the biggest concern here.

Alejandro Osuna just hits. A player I have seen live quite often, I have seen Osuna hit for the cycle as well as hit some impressive home runs. Splitting time between Double-A and Triple-A in 2025, Osuna slashed .279/.386/.416 with two home runs and nine stolen bases.

Osuna sprays line drives to all fields well, but he also can get loft and get to the pull side home run power. The 90th percentile exit velocity being north of 105 mph is pretty impressive when you pair it with the fact that 55 percent of batted balls went in the air.

The contact skills are good. Osuna ran an overall mark of 89 percent between both levels, with a chase rate in the low 20 percent range. His in-zone contact rate has been north of 90 percent.

While being smaller in stature, Osuna runs well and puts 100 percent effort into every play. He is passionate and plays bigger than his 5-foot-9 frame. He makes a ton of contact, which gives him a high floor to succeed right away in the majors.

 

Dynasty Trends: Swing Path and Attack Angle Metrics

Baseball Savant got new stats, so, of course, we need to talk about them. One thing I love about baseball is how in-depth we can research it. Some may say it is too much, but I think if there is something to be learned about player evaluation and we can have a deeper understanding, it is a good thing.

Here is how Baseball Savant defines its new metrics:

"Attack Angle and Attack Direction both pertain to the direction in which the sweet spot of the bat is traveling as it impacts the ball. Attack Angle measures the vertical component of that direction, as compared to the ground, while Attack Direction measures the horizontal component, in degrees towards the "PULL" or "OPPO" direction, as compared to an imaginary line directed from home plate to straightaway center field."

  • Contacting the ball with an Attack Angle between 5-20° is considered "ideal."

"Swing Path Tilt measures the angular orientation of the "plane" of the swing, as compared to the ground, defined by the path of the bat in the 40 ms prior to contact, which approximates a slice of a flat disc in shape. A higher angle is a "steeper" swing (further from horizontal) and a lower angle is a "flatter" swing (closer to horizontal)."

Highest Ideal Attack Angle%

Player
Name
Ideal Attack Angle%  
Luis Urias 74.3
Corbin Carroll 73.7
Brenton Doyle 71.5
Miguel Vargas 70.2
Kyle Schwarber 70.2
Alex Bregman 67.8
William Contreras 67.8
Juan Soto 67.6
Carlos Santana 67.1

Lowest Ideal Attack Angle%

Player Ideal Attack Angle%. 
Xavier Edwards 31.5
Vladimir Guerrero Jr. 33.2
Ben Williamson 33.2
Steven Kwan 33.2
James Wood 34.2
J.P. Crawford 35
Jacob Wilson 36.4
Bo Bichette 37.5
Isiah Kiner-Falefa 38.2

 

Fantasy Baseball Dynasty Buys and Sells

Are we buying Hunter Brown as an ace? Is he a top-5 dynasty SP at this point? This year has shown his dominance by posting a 2.04 ERA and a 0.91 WHIP in 61 2/3 innings. This is not a new thing, either. Dating back to last May, Brown owns a 2.22 ERA with 209 strikeouts in 194 1/3 innings.

Brown has shown improved command and is walking less than 7 percent of hitters. The strikeout rate has also jumped to nearly 31 percent thanks to a jump in stuff. Brown's 111 stuff+ is the fifth-best mark in baseball, while the 113 pitching+ ranks eighth, according to Eno Sarris' model.

When you have elite stuff and a six-pitch mix, you set yourself up for success. Brown has an elite 32 percent whiff rate on his four-seam fastball and has two other pitches with a 30 percent whiff rate. I think buying high on Brown is a good idea.

Geraldo Perdomo is a good sell-high in dynasty. Given that he is 25 years old and currently performing as a top 25 player, you have a good sell opportunity. In 225 plate appearances, Perdomo is slashing an impressive .302/.399/.473 with six home runs and 11 stolen bases.

So, why sell Perdomo? Perdomo has already reached a career high in homers and is pushing his career-best stolen base mark of 16. This is not to say that he is going to stop hitting homers or stealing bases, but regression seems likely.

While the exit velocities have improved, they are still well below average, and Perdomo's barrel rate of 4.8 percent ranks in the 18th percentile among MLB hitters. While I am not a huge proponent of expected stats, Perdomo's xSLG is .397, and the xBA is .262.

The contact skills are elite, but I expect Perdomo to continue trending toward career norms. If you can sell him for a top-100 dynasty asset, I absolutely would.



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 Advice




POPULAR FANTASY TOOLS

Expert Advice
Articles & Tools
Import Your Leagues
Daily Stats & Leaders
All Pitcher Matchups
Compare Any Players
Compare Any Players
Rookies & Call-Ups
24x7 News and Alerts

REAL-TIME FANTASY NEWS

Yordan Alvarez

has Chance to Return Next Weekend
Julius Randle

Signs Three-Year Extension
Kelly Oubre Jr.

Opts into Player Option
Luis Robert Jr.

Heads to Injured List
Gabriel Arias

Carted Off on Sunday
Bryce Harper

Faces Live Pitching
Jeremy Peña

Jeremy Pena Remains Out on Sunday
Utah Jazz

Bojan Bogdanovic Retiring From Basketball
Dorian Finney-Smith

Declines Player Option
Jaylin Williams

Signing Three-Year Extension
LeBron James

Accepts Player Option
Anfernee Simons

"a Possible Re-Trade Candidate"
Chase Elliott

Ends Winless Skid With Atlanta Victory
Brad Keselowski

Falls Short of Atlanta Victory
NFL

NFL Won't Hold Supplemental Draft This Year
Damon Arnette

Getting Second Chance With Texans
Deommodore Lenoir

Arrested for Obstruction of Justice
Yordan Alvarez

Eyeing Return Before All-Star Break
Kevin Porter Jr.

Declining Player Option
Carson Hocevar

Recovers From Big One to Finish 10th at Atlanta
William Byron

Caught up in Atlanta Big One but Retains Points Lead
Denny Hamlin

Top In-Season Challenge Seed Denny Hamlin Eliminated in Lap 70 Crash
Ty Dillon

Bottom Seed Ty Dillon Upsets Denny Hamlin to Advance in In-Season Challenge
Quinn Priester

Fans 11 in One-Hit Gem
Garrett Temple

Returning to Toronto
Nicolas Batum

Declines Player Option
Spencer Schwellenbach

Dominant in Victory
Keon Johnson

Gets Team Option Picked Up
Rayan Rupert

Staying in Portland
Jonathan Kuminga

Recieves Qualifying Offer
Marvin Harrison Jr.

Expected to Make Second-Year Jump
Jeremy Peña

Jeremy Pena Out of Lineup Saturday
Sam Merrill

Sticking with Cavaliers
Davion Mitchell

Staying in Miami
Jalin Hyatt

Looking to Flip the Script in 2025
Garrett Mitchell

to Undergo Shoulder Surgery
José Ramírez

Jose Ramirez in Guardians Lineup on Saturday
Kyle Larson

Don't Expect Kyle Larson to Win First Drafting Track Race on Saturday
Christopher Bell

Unlikely to Complete Atlanta Sweep
Brad Keselowski

Seeks Another Clutch Win for Hail-Mary Playoff Bid
Chris Buescher

Unlikely to Lead Enough to Have Much DFS Value
Alex Bowman

Qualifies Best Among Non-Fords but Unlikely to Contend at Atlanta
Ryan Preece

Will Probably Run Better Than Usual at Atlanta
Austin Dillon

Consistently Mediocre at Atlanta
Ty Gibbs

Slightly Faster Lately but Unlikely to be a Factor at Atlanta
Erik Jones

a Low-Key Strong DFS Option
Noah Gragson

Could Have DFS Value as One of the Lowest-Qualifying Fords
Riley Herbst

Unlikely to Replicate February Atlanta Finish
Ty Dillon

Could Benefit from Kaulig Speed
Cody Ware

Rarely Enough Attrition at Atlanta for Cody Ware to Seriously Contend
Ryan Blaney

Is Always Strong at Atlanta
Joey Logano

Wins Pole, Looking for Third Atlanta Win
Isaac Okoro

on the Move to Chicago
Chase Burns

Slated to Make Next Start on Monday
Lonzo Ball

Traded to Cleveland
Dylan Sampson

Being Used as a Receiver
Carson Schwesinger

Figures to be in Full-Time Role in 2025
Cedric Tillman

Should Have Full-Time Role
Bryce Young

Looking More Comfortable, Showing More Intensity
Charlie Coyle

Blue Jackets Acquire Charlie Coyle and Miles Wood From Colorado
Jack Quinn

Signs Up for Two More Years with Sabres
Brandon Saad

Stays in Vegas on One-Year Deal
Trent Frederic

Inks Eight-Year Extension
Josh Naylor

Exits Friday's Contest Early with Neck Stiffness
Emil Heineman

Shipped to the Islanders
Noah Dobson

Traded to Montreal
John Tavares

Agrees to Four-Year Extension with Maple Leafs
Sam Bennett

Signs Eight-Year Extension with Panthers
NYI

Islanders Select Matthew Schaefer With No. 1 Pick in NHL Draft
José Berríos

Jose Berrios Tosses Seven Scoreless Innings in Fourth Win
Nick Martinez

Flirts With No-Hitter, Settles for Win
Gary Sánchez

Gary Sanchez Homers, Reaches Five Times in Onslaught
Trea Turner

Blasts Two Homers, Steals Base
Los Angeles Angels

Ron Washington to Remain on Medical Leave for Rest of the Season
Jeremy Peña

Imaging Negative on Jeremy Pena's Ribs on Friday
Spencer Steer

Slugs Three Home Runs in Win
Ace Bailey

to Report to Utah on Saturday
Sonny Gray

Tosses Complete-Game Shutout
Justin Edwards

Sixers Agree on a New Contract
Naz Reid

Agrees to a New Contract with Minnesota
Aaron Rodgers

Roman Wilson Could Fit Nicely With Aaron Rodgers
Josh Simmons

on Schedule to Open the Year as a Starter
Micah Parsons

Contract Length an Issue for Cowboys, Micah Parsons
Denver Broncos

Broncos Unsure How Their Running Back Room Will Look
Russell Wilson

Not the Only Leader in Giants Clubhouse
Jae'Sean Tate

Rockets Want to Bring Back Jae'Sean Tate
Jihaad Campbell

to Begin at Inside Linebacker
Josh Conerly Jr.

to Play Right Tackle for Now
Tyleik Williams

Expected to Fill Big Role Right Away
Malaki Starks

Should Make an Immediate Impact
James Pearce Jr.

Impressing the Falcons
Jaxson Dart

has "Excellent" Spring
Donovan Jackson

has Inside Track on Starting Job
Charles Oliveira

Can Become A Two-Time Lightweight Champion
Ilia Topuria

A Favorite At UFC 317
Kai Kara-France

Can Become The New Flyweight Champion
Alexandre Pantoja

Set For Fourth Title Defense At UFC 317
Joshua Van

Looks To Extend His Win Streak
Brandon Royval

Looks For His Third Win In A Row
Renato Moicano

Returns At UFC 317
Beneil Dariush

An Underdog At UFC 317
Payton Talbott

Looks To Bounce Back
Felipe Lima

Set To Open Up UFC 317 Main Card
Daniil Tarasov

Panthers Bring in Daniil Tarasov
Frederick Gaudreau

Kraken Pick Up Frederick Gaudreau From Wild
SJ

Sharks Buying Out Marc-Edouard Vlasic
Jamie Benn

Stays in Dallas on One-Year Deal
Reilly Smith

Signs New One-Year Deal with Vegas
Michael Kesselring

Traded to Sabres
Josh Doan

Moves to Buffalo
JJ Peterka

Mammoth Acquire JJ Peterka
Evander Kane

Traded to Canucks
Michael Thorbjornsen

Returns in Detroit at Rocket Classic
Adam Hadwin

Could Struggle Over the Weekend in Detroit
Cam Davis

Hopes Detroit Magic Can Spark Turnaround
Matt Wallace

a Boom-or-Bust Option at Rocket Classic
Joel Dahmen

Not Cutting it Lately
Michael Kim

Searching for Spark at Rocket Classic
Rasmus Hojgaard

a High-Ceiling Play in Rocket Classic
Matt McCarty

a Wild Card Heading into Detroit
Emiliano Grillo

Rolling into the Summer Season
Rickie Fowler

Looking for More Magic at Rocket Classic
Wyndham Clark

Brings High Upside to Detroit Golf Club
Max Greyserman

Could Make Noise at Rocket Classic
Akshay Bhatia

a Strong Value Play at Rocket Classic
Eric Cole

Hoping for Better Times at Rocket Classic
Beau Hossler

Searching for Form at Rocket Classic
PGA

Byeong Hun An in Good Form Heading into Rocket Classic
Cameron Young

Looking For Redemption and Possible First Career Victory in Detroit
Collin Morikawa

is The Headliner This Week in Detroit For Good Reason
Si Woo Kim

Back in Competition After Last Week's Withdrawal
PGA

Alex Noren Finishes Tied For 30th at Travelers Championship
Kurt Kitayama

Misses The Cut at RBC Canadian Open
Ryan Poehling

Becomes a Duck
Trevor Zegras

Moves to Philadelphia
Andre Burakovsky

Traded to Blackhawks
RANKINGS
C
1B
2B
3B
SS
OF
SP
RP

RANKINGS

QB
RB
WR
TE
K
DEF