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Fantasy Baseball Rookie Risers/Fallers (Week 7)

Jon Denzler reflects on fantasy baseball prospects and rookie debuts from last week, including prospect stocks that are rising and falling for fantasy owners.

Well, the Major League season is already 23% of the way done. Some owners think that they are on their way to victory while others are patiently waiting for things to turn around. Still, while all the victory laps are being taken, the smart owner is looking forward to the rest of the year and finding what value can still be had. While the season always seems to move quickly, the dog days of summer are still upon us.

Now that we are rolling along, so too are the call-ups. This week, the Rotoballer team keeps tabs on all the new names and faces, with insight into their fantasy value to help any team. For owners looking for a cheap spark, look no further.

For redraft, dynasty, or general fantasy players knowing the new prospects is key to begin to plan out FAAB bids and waiver claims. Target or avoid these players to helps teams keep their competitive windows open.

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

 

Rookie Debuts - Stock Up

These players helped their fantasy value with solid debut weeks for their respective team. If not on owners's radars, these players need to be.

 

Nicky Lopez (2B, KC)

A fifth-round pick back in 2016 by the Royals, Lopez has moved through the system quickly due to a polished hit tool. Through 353 career games in professional ball, Lopez has a .296.378/.403 slash with 20 homers and 69 steals. Stepping into what looks to be a starting gig with Kansas City, Lopez has been hitting second and playing second base every day since the call. This means that Whit Merrifield will move to the outfield, and will hint at future moves with the roster. Whatever the case, Lopez seems to be a factor for the team this year with the early call.

Fantasy owners are happy with five hits in 11 ABs so far, but the lack of any counting stats is telling. Lopez will be a good batting average option but will offer little to no power, and perhaps, a handful of steals. The glove will keep him in the team, but when the Royals are competitive, if he is around, expect him to be hitting in the bottom third of the lineup. Stock is up with the early call, but expect D.J. LeMahieu without the power upside. In dynasty, owners can sell while there is some hype for surplus value.

 

Corbin Martin (SP, HOU)

The Houston native and boyhood Astros fan lit up the league in his first start. While only going 5.1 innings, he managed to rack up nine Ks, and only walked one. Getting the call before fellow top pitching prospect Forrest Whitley, Martin was posting a 1.48 ERA over 24.1 innings before the move. While Whitley still has the higher floor of the pair, Martin took a jump to start this year, and now looks to be a key piece in this rotation. With Colin McHugh heading to the bullpen, the spot is there even with some concerns on length.

Martin offers four pitchers, with a plus fastball being the main out pitch. In his one start he tended to sit with this pitch up in the zone but liked to throw the change-up down and away to righties. While the grouping will need to move a bit more to stay ahead of the hitters, the vertical approach can keep getting him Ks without an elite breaking option. Martin is my top FAAB bid this week and owners should break the bank to add a top arm, on a top team. If Whitley is still out there, wait, but if not, this is the target.

 

Cole Irvin (SP, PHI)

In his debut start of the campaign, Irvin worked effectively and posted seven strong innings versus the Royals. Ranked as a mid-teens  prospect within the Phillies organization by most sites, Irvin projects as an SP4 type over the rest of his career. With a fastball that tops out in the high-80s, Irvin will need to use his command to keep batters off his offerings. In his debut, that was the case, with one walks and five Ks. While he did give up five hits, he did not give up a single barrel.

The stock is up since Irvin could be an innings source for desperate fantasy owners. Not only are the Phillies looking to be on pace to win 90 games this year, a start, with length, can add eight or more victories the rest of the way. While he might only be around until Vince Velasquez is back, that still means three starts to show what he has. Expect the K numbers to be down, but the WHIP will make up for that. Irvin could be an SP3 in fantasy with the wins, and an easy, cheap add this week.

 

Rookie Debuts - Stock Neutral

These players neither helped nor hurt their fantasy value in the first week of play.

Austin Riley (3B/OF, ATL)

Even with the early hot start to his career, Riley’s stock is neutral due to playing time concerns. For the time being, it looks like he will have a chance to play in left, or at least, fill in the outfield with Ronald Acuna Jr. moving to center. Not only does Reilley lack real experience in the outfield, but might only be up for the next week or so. Obviously if he keeps hitting, the Braves will make other moves, but for now, watch the injury news on Ender Inciarte for a clear read on how to roster Riley.

In terms of his fantasy value, Riley might be one pf the top hitting options the rest of the way. A plus hit tool coupled with plus plus power makes Riley an offensive threat in all formats. There is a ton of swing-and-miss, with 1.36 Ks per game in the minors. And yet, the potential is there to make up for it, and if owners can settle for a .240 batting line, Riley can be a crucial option this week. Long-term he is still one of the top prospects in fantasy baseball, and for this year, the only real limit is playing time.

 

Rookie Debuts - Stock Down

These players hurt their fantasy value during their first week of play.

Shed Long (2B, SEA)

After the trade to New York and then to Seattle, Long’s stock is down with the move away from Great American. When the hit tool is the key, even something like the park might be key to what options he offers moving forward. After a hot start to the year at Triple-A, Long found himself in the mix due to some roster needs, and got the call sooner than expected. After slashing .295/.364/.535 with four homers over 33 games, Long was putting together his best showing in the upper minors, and peaked interest in the front office. From there he went hitless in 11 ABs with Seattle and is already back down in the minors, so no dice on that FAAB bid.

Long will be a frustrating prospect to own, as the hit tool shows enough promise to profile as a fantasy bat, but also, he lacks the glove to hold down a spot. After starting as a catcher, he has moved to the outfield, and second. If he can stay at second, he profiles as a .260/15/8 option which will be rosterbable in most formats. And yet, returning to the power limits at his home park, the batting average along might not be there to play. Still, with a spot to play on a team entering a rebuild, there might be playing time to boost the line.

 

Oscar Mercado (OF, CLE)

After being added in an intriguing trade with St. Louis last deadline by Cleveland, Mercado been a lingering option to play in the outfield. With any Cleveland outfielder, the context is critical, as there are no firm starts in the team as out now. Jordan Luplow might be the most apparent option, as the only right-handed bat hitting as of now. With left field, Jake Bauers will be rotated through, but also will take some time at first and designated hitter. Center and Mercado’s best spot is held down by Leonys Martin, but when he has not been hitting, there is a change coming soon.

This all means that Mercado will find playing time, but might be too raw for impact as of now. While he was hitting .294 at Triple-A, owners should expect something closer to the .254 career mark in the minors. With minimal power, the speed and glove are the carrying tools. The issue will be the batting line, as he will struggle early, causing the playing time to drop, and therefore limit the steals. For now let others break the bank, but in dynasty try to buy while the stock is down. With playing time he does have value, but the hype is a bit much for the no floor prospect in Cleveland.

More MLB Prospects Analysis




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REAL-TIME FANTASY NEWS

Paul George

Won't Play Wednesday Night
Onyeka Okongwu

Available on Tuesday
Joel Embiid

Listed as Doubtful for Wednesday
Jalen Suggs

Available Tuesday
Zaccharie Risacher

Ruled Out With Hip Contusion vs. Pistons
Odell Beckham Jr.

Officially Reinstated by NFL Commissioner
Kristaps Porzingis

Ruled Out on Tuesday Night
Buddy Hield

Available for Tuesday's Matchup With Orlando
Matt Murray

to Miss Six Weeks With Lower-Body Injury
Ilya Lyubushkin

Out on Tuesday
Giannis Antetokounmpo

Out 1-2 Weeks With Groin Strain
Jamie Benn

Makes Season Debut Tuesday
Stephon Castle

Sidelined 1-2 Weeks
Evgenii Dadonov

on Track to Return Tuesday
Dougie Hamilton

a Game-Time Call Tuesday
Anthony Cirelli

Expected to Return Against Devils
Victor Hedman

Questionable for Tuesday
LeBron James

Aims to Make Season Debut Tuesday
Auston Matthews

to Miss at Least Two More Games
Grayson Allen

Sidelined on Tuesday
Gabe Vincent

Set to Suit Up Tuesday
C.J. Stroud

Expected to Return in Week 13 Against Colts
C.J. Stroud

to Miss Another Game
Jonathan Kuminga

Remains Out Tuesday
Keegan Murray

Could Make his Season Debut This Week
Caris LeVert

Liston as Out on Tuesday
Tobias Harris

Could Return Thursday
Ausar Thompson

Questionable Again on Tuesday
Joe Mixon

Uncertainty Remains Around Joe Mixon's Return Timeline
Cade Cunningham

is Questionable Tuesday in Atlanta
Jaylen Warren

Mike Tomlin Optimistic About Jaylen Warren's Availability for Week 12
C.J. Stroud

Not Expected to Play on Thursday Night
Aaron Rodgers

Won't Need Surgery on Fractured Wrist, Could Play in Week 12?
Davis Mills

Prepping for Third Straight Start in Week 12?
CFB

Sam Leavitt Set to Enter Transfer Portal?
Mason Rudolph

Could Make His First Start of 2025 in Week 12
Brock Wright

Sets Career-High in Targets; Lined Up for More Work?
Stephon Castle

Out Against Grizzlies
Kimani Vidal

Struggles Again and Faces Role Uncertainty After Bye
Dak Prescott

in Full Command Monday Night With Four Touchdown Passes
Quentin Johnston

Posts Zero Catches During Offensive Collapse
George Pickens

Erupts for 144 Yards, Touchdown in Monday Night Win
Jrue Holiday

Unlikely to Play Tuesday
CeeDee Lamb

George Pickens Benched for First Drive
LeBron James

Officially Listed as Questionable for Tuesday
Jose Altuve

Undergoes Foot Surgery
Alex Singleton

Broncos Optimistic Patrick Surtain, Alex Singleton Will Return After the Bye
Trey Hendrickson

Doubtful Again in Week 12
Shedeur Sanders

Expected to Make First Career Start in Week 12
Josh Jacobs

Dealing With Knee Contusion
Mikael Granlund

Unavailable Monday
Alex Bregman

Red Sox Going for Either Alex Bregman or Pete Alonso?
Conor Garland

Misses Monday's Game
Eetu Luostarinen

Out on Monday
Drake London

Considered "Week-to-Week"
Drew Doughty

Listed as Week-to-Week
Ja'Marr Chase

Being Suspended for One Game for Unsportsmanlike Conduct
John Carlson

a Game-Time Call Monday
Viktor Arvidsson

Out Week-to-Week
Charlie McAvoy

Out Against Hurricanes
CFB

James Franklin to be Virginia Tech's Next Head Coach
CFB

Fernando Mendoza the Clear Heisman Trophy Favorite?
CFB

Beau Pribula Has Chance to Face Oklahoma on Saturday
Mitchell Marner

Establishes Vegas Record Sunday
Mats Zuccarello

Logs Two Assists in Overtime Victory
Lucas Raymond

Leads Red Wings to Victory at MSG
Quinn Hughes

Delivers Four Assists in Sunday's Win
Conor Garland

Limited to Handful of Minutes Sunday
Ryan Hartman

Suffers Lower-Body Injury
Jack Della Maddalena

Gets Dominated
Islam Makhachev

Claims UFC Welterweight Belt
Zhang Weili

Gets Outclassed
Valentina Shevchenko

Wins Unanimous Decision At UFC 322
Sean Brady

Suffers First-Round TKO Loss
Michael Morales

Remains Unbeaten
Leon Edwards

Suffers Second-Round Knockout Loss
Leon Edwards

Carlos Prates Becomes The First Man To Knock Out Leon Edwards
Beneil Dariush

Suffers Brutal First-Round Knockout Loss
Beneil Dariush

Benoit Saint Denis Knocks Out Beneil Dariush In 16 Seconds
Josh Naylor

Mariners Finalizing Five-Year Contract
CFB

Jeremiah Smith, Carnell Tate Not Dealing With Long-Term Injuries
CFB

Virginia Tech Close To Naming James Franklin As Head Coach
CFB

Garrett Nussmeier Doubtful vs. Arkansas On Saturday
Edwin Díaz

Blue Jays Interested in Signing Edwin Diaz?
Jacob deGrom

Named AL Comeback Player of the Year
Ronald Acuña Jr.

Ronald Acuna Jr. Wins NL Comeback Player of the Year Award
Aroldis Chapman

Named AL Reliever of the Year
Edwin Díaz

Edwin Diaz Named NL Reliever of the Year
Justin Thomas

Will Miss Start Of 2026 After Undergoing Back Surgery
Islam Makhachev

Set For UFC 322 Main Event
Jack Della Maddalena

Set For His First Title Defense
Zhang Weili

Can Become The New Women's Flyweight Champion
Valentina Shevchenko

Set For UFC 322 Co-Main Event
Michael Morales

Looks To Remain Undefeated
CFB

Mario Craver a Game-Time Decision for Week 12
Sean Brady

Set For Title Eliminator Bout
Carlos Prates

A Favorite At UFC 322
Leon Edwards

Looks To Get Back In The Win Column
Benoît Saint Denis

Benoit Saint Denis Set To Open Up UFC 322 Main Card
Beneil Dariush

Looks To Win Back-To-Back Fights
CFB

Virginia's Chandler Morris Trending Toward Facing Duke on Saturday
Edwin Díaz

Edwin Diaz Says There's a "50-50" Chance he Returns to Mets
Shohei Ohtani

Wins his Fourth MVP Award
Aaron Judge

Wins AL MVP Award Again
Raisel Iglesias

Dodgers Interested in Signing Raisel Iglesias
Pete Alonso

Orioles Could be in the Mix to Sign Pete Alonso
Félix Bautista

Felix Bautista Could Return in Second Half in 2026
Kodai Senga

Attracting Trade Interest, Will the Mets Move him?
Yordan Alvarez

Expected to be Ready for Spring Training
Byron Buxton

Could Waive his No-Trade Clause
Paul Skenes

the Unanimous NL Cy Young Winner
Tarik Skubal

Wins AL Cy Young for Second Straight Year

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