Marcelo Mayer

Marcelo Mayer

22-Year-Old ShortstopSS
Boston Red Sox
2025 Fantasy Outlook
Mayer mastered Double-A (142 wRC+ in 77 games) after struggling at that level in 2023 (63 wRC+ in 43 games), but after another injury-marred season, his fragility is starting to become his most discussed quality. His 91 games in 2022 represent a career high, and perhaps fittingly, he was promoted to Triple-A in early August but never got into a game for Worcester due to hip and back injuries. He slashed .307/.370/.480 with eight home runs, 13 steals, a 19.7 percent strikeout rate and an excellent 31.5 percent hard-hit rate as a 21-year-old repeating Double-A. Mayer's best skills are his shortstop defense, followed by above-average power and a potentially above-average hit tool. He has multiple years with double-digit steals in the minors, but Mayer's pure speed is average at best, so we can't bank on him making a notable impact in stolen bases. Even if Mayer reached his realistic fantasy ceiling, he'd be a fringe top-15 fantasy shortstop due to the lack of a standout tool, and his durability issues make it difficult to sell him as a potential compiler in the Dansby Swanson mold. He'll be an option this summer if he's healthy and Trevor Story is hurt or struggling. Read Past Outlooks
RANKS
Rest of Season From Preseason
#400
ADP
$Signed a one-year contract with the Red Sox in May of 2025.
On bench against lefty
SSBoston Red Sox
June 22, 2025
Mayer is out of the lineup for Sunday's game against the Giants.
ANALYSIS
After starting in each of the last five games, the left-handed-hitting Mayer will head to the bench while the Red Sox stock up on extra right-handed bats to counter Giants southpaw Robbie Ray. Nate Eaton will cover third base in Mayer's stead.
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Batting Stats
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2025
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Batting Order Slot Breakdown
vs Right-Handed Pitchers
vs RHP
#1
#2
#3
#4
#5
#6
#7
#8
#9
1
7
4
5
vs Left-Handed Pitchers
vs LHP
#1
#2
#3
#4
#5
#6
#7
#8
#9
1
1
Left/Right Batting Splits
Since 2023
 
 
+284%
OPS vs RHP
2025
 
 
+284%
OPS vs RHP
2024
No Stats
2023
No Stats
OPS PA R HR RBI SB AVG OBP SLG
Since 2023vs Left .200 10 1 0 0 0 .100 .100 .100
Since 2023vs Right .768 63 10 4 6 0 .214 .286 .482
2025vs Left .200 10 1 0 0 0 .100 .100 .100
2025vs Right .768 63 10 4 6 0 .214 .286 .482
2024vs Left 0 0 0 0 0 0 0 0 0
2024vs Right 0 0 0 0 0 0 0 0 0
2023vs Left 0 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0 0
More Splits View More Split Stats
Minor League Splits View Minor League Split Stats
Home/Away Batting Splits
Since 2023
 
 
+38%
OPS at Home
2025
 
 
+38%
OPS at Home
2024
No Stats
2023
No Stats
OPS PA R HR RBI SB AVG OBP SLG
Since 2023Home .834 26 5 2 4 0 .217 .269 .565
Since 2023Away .604 47 6 2 2 0 .186 .255 .349
2025Home .834 26 5 2 4 0 .217 .269 .565
2025Away .604 47 6 2 2 0 .186 .255 .349
2024Home 0 0 0 0 0 0 0 0 0
2024Away 0 0 0 0 0 0 0 0 0
2023Home 0 0 0 0 0 0 0 0 0
2023Away 0 0 0 0 0 0 0 0 0
More Splits View More Split Stats
Stat Review
How does Marcelo Mayer compare to other hitters?
This section compares his stats with all batting seasons from the previous three seasons (minimum 400 plate appearances)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.

* Exit Velocity and Barrels/PA % are benchmarked against 2019 data (min 400 PA) and Hard Hit Rate is benchmarked against last season's data (min 400 PA). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • BB/K
    Walk to strikeout ratio
  • BB Rate
    The percentage of plate appearances resulting in a walk.
  • K Rate
    The percentage of plate appearances resulting in a strikeout.
  • BABIP
    Batting average on balls in play. Measures how many of a batter’s balls in play go for hits.
  • ISO
    Isolated Power. Slugging percentage minus batting average. A computation used to measure a batter's raw power.
  • AVG
    Batting average. Hits divided by at bats.
  • OBP
    On Base Percentage. A measure of how often a batters reaches base. Roughly equal to number of times on base divided by plate appearances.
  • SLG
    Slugging Percentage. A measure of the batting productivity of a hitter. It is calculated as total bases divided by at bats.
  • OPS
    On base plus slugging. THe sum of a batter's on-base percentage and slugging percentage.
  • wOBA
    Weighted on-base average. Measures a player's overall offensive contributions per plate appearance. wOBA combines all the different aspects of hitting into one metric, weighting each of them in proportion to their actual run value.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Hard Hit Rate
    A measure of contact quality from Sports Info Solutions. This stat explains what percentage of batted balls were hit hard vs. medium or soft.
  • Barrels/PA
    The percentage of plate appearances where a batter had a batted ball classified as a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Expected BA
    Expected Batting Average.
  • Expected SLG
    Expected Slugging Percentage.
  • Sprint Speed
    The speed of a runner from home to first, in feet per second.
  • Ground Ball %
    The percentage of balls put in play that are on the ground.
  • Line Drive %
    The percentage of balls put in play that are line drives.
  • Fly Ball %
    The percentage of balls put in play that are fly balls.
BB/K
0.27
 
BB Rate
8.2%
 
K Rate
30.1%
 
BABIP
.220
 
ISO
.227
 
AVG
.197
 
OBP
.260
 
SLG
.424
 
OPS
.685
 
wOBA
.297
 
Exit Velocity
92.9 mph
 
Hard Hit Rate
35.6%
 
Barrels/PA
6.8%
 
Expected BA
.232
 
Expected SLG
.448
 
Sprint Speed
24.4 ft/sec
 
Ground Ball %
55.6%
 
Line Drive %
13.3%
 
Fly Ball %
31.1%
 
Prospect Rankings History
Advanced Batting Stats
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Additional Stats
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Defensive Stats
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Batted Ball Stats
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Past Fantasy Outlooks
2024
2023
2022
Mayer will be a big-league regular, but the closer he gets to the majors, the less he looks like a future fantasy star. As one of the slower shortstop prospects of note, Mayer won't be a major threat on the bases, so he has to move the needle at the plate. His walk rate has decreased at every full-season stop, dipping to 7.9 percent in 43 games at Double-A, and his 25.8 percent strikeout rate at Double-A was the worst mark of his career. Mayer reportedly dealt with a left shoulder impingement during his struggles at Double-A, and he eventually got shut down in early-August and received an injection in September. He has a career .280/.371/.494 slash line with 11 home runs in 60 games at High-A, so if the injury was the cause of his issues at Double-A, he could bounce back with similar production to what he showed at High-A in 2022 and 2023. A big reason Mayer ranks highly on real-life prospect rankings is his plus defense at shortstop, and while that figures to guarantee him playing time in the future, that's the extent of its importance for his fantasy value. He could debut late this year, but don't expect him to produce at an acceptable clip in fantasy until at least 2025.
Mayer's top skill so far in pro ball has been his patience at the plate, sporting a career 15.6 BB% in 531 plate appearances from rookie ball through High-A. His strikeout rate has remained a steady 25% while showing average game power as a teenager. Despite middling home run totals, Mayer's 36.0 Hard% and 14.0 Soft% were excellent marks in his full-season debut, and he could end up with above-average or plus game power in a few years. He's nearly physically mature and nowhere near as fast as his 17-for-17 on the bases in 2022 indicates. He doesn't have the typical athleticism associated with shortstop, but most evaluators believe he can stick there, at least early in his big-league career. At this point, Mayer might be more appealing in dynasty leagues for his high floor than his ceiling, but there are still some pretty high-end potential outcomes if he can cut down on the strikeouts in the coming years.
Four of the top six fantasy prospects from the 2021 draft were prep shortstops, and Mayer may be the best of the bunch. Some analysts thought he should have been the pick at 1-1, but he slid to Boston with the fourth-overall pick and signed for slot value ($6.66 million). His bat will be his calling card, as he projects as a plus hitter from the left side who should grow into plus all-fields power. At 6-foot-3, 188 pounds, he has a prototypical frame to grow into without compromising his baseball actions. He is just a fringe-average runner now and should slow down, so his range won't be great, but he's a very smooth defender who makes all the routine plays. Mayer was as good as advertised in his limited pro debut, hitting .275/.377/.440 with three home runs and a 121 wRC+ in 26 games in the Florida Complex League. His patience at the plate was noteworthy (14.0 BB%), and while he didn't face strong competition, he was age-appropriate for the level. His picturesque left-handed swing and extensive track record make him as close to a can't-miss high school prospect as we've seen in recent years.
More Fantasy News
Idle against lefty Sunday
SSBoston Red Sox
June 15, 2025
Mayer is out of the lineup for Sunday's game against the Yankees.
ANALYSIS
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Idle against lefty
SSBoston Red Sox
June 13, 2025
Mayer is out of the lineup for Friday's game against the Yankees, Gabrielle Starr of the Boston Herald reports.
ANALYSIS
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First career multi-homer game
SSBoston Red Sox
June 11, 2025
Mayer went 2-for-4 with a pair of solo home runs in Wednesday's 4-3 win over the Rays.
ANALYSIS
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Hitting bench vs. southpaw
SSBoston Red Sox
June 8, 2025
Mayer is out of the lineup for Sunday's game against the Yankees, Mac Cerullo of the Boston Herald reports.
ANALYSIS
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Cracks first MLB home run
SSBoston Red Sox
June 7, 2025
Mayer went 1-for-2 with a solo home run in Friday's 9-6 loss to the Yankees.
ANALYSIS
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Latest Fantasy Rumors
Call-up after Bregman injury?
SSBoston Red Sox
May 24, 2025
Red Sox manager Alex Cora on Saturday didn't rule out the possibility of Mayer being called up from Triple-A Worcester following Alex Bregman's quadriceps injury, Rob Bradford of WEEI.com reports.
ANALYSIS
Bregman injured his right quad while rounding first base in Friday's game against the Orioles. Mayer's name had been floated around for a promotion to the majors after Triston Casas suffered a season-ending knee injury in early May, and the former could be on his way to the big club to provide infield depth if Bregman needs a stint on the injured list. Mayer is slashing .265/.342/.465 with two steals, nine home runs and 43 RBI over 193 plate appearances in Triple-A this season.
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