Miles Mastrobuoni

Miles Mastrobuoni

30-Year-Old Third Baseman3B
Seattle Mariners
10-Day IL
Injury Calf
Est. Return 4/10/2026
2026 Fantasy Outlook
Mastrobuoni is a replacement level utility player who is out of minor-league options. The Mariners lack established options at third base and second base, but they have young players who have more ceiling than the 30-year-old Mastrobuoni and a comparable floor. When Mastrobuoni is in the lineup, the one category he assists in is steals, having stolen 13 bases in 61 games in 2023 and six bases in 76 games in 2025. He has two homers and a .231 average in 195 career games. It's possible he will be designated for assignment if Colt Emerson wins an Opening Day roster spot. Read Past Outlooks
Signed a one-year contract with the Mariners in March of 2026.
Sidelined with calf strain
3BSeattle Mariners
Calf
March 25, 2026
The Mariners placed Mastrobuoni (calf) on the 10-day injured list Wednesday.
Analysis
Mastrobuoni strained his right calf while playing for Team Italy in the World Baseball Classic two weeks ago. He'll be eligible to return April 1, but the utility player figures to require a bit more down time than that.
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Batting Stats
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2026 MLB Game Log
2026
2025
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2023
2022
2026 MLB Game Log
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2025 MLB Game Log
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2024 MLB Game Log
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2023 MLB Game Log
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2022 MLB Game Log
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Minor League Game Log
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Left/Right Batting Splits
Since 2024
 
 
+8%
OPS vs LHP
2026
No Stats
2025
 
 
+35%
OPS vs LHP
2024
 
 
+30%
OPS vs RHP
OPS PA R HR RBI SB AVG OBP SLG
Since 2024vs Left .598 35 4 0 2 0 .242 .265 .333
Since 2024vs Right .556 246 25 1 14 8 .226 .298 .258
2026vs Left 0 0 0 0 0 0 0 0 0
2026vs Right 0 0 0 0 0 0 0 0 0
2025vs Left .804 19 3 0 1 0 .294 .333 .471
2025vs Right .596 156 17 1 11 6 .244 .322 .274
2024vs Left .375 16 1 0 1 0 .188 .188 .188
2024vs Right .487 90 8 0 3 2 .195 .256 .232
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Home/Away Batting Splits
Since 2024
 
 
+46%
OPS on Road
2026
No Stats
2025
 
 
+31%
OPS on Road
2024
 
 
+98%
OPS on Road
OPS PA R HR RBI SB AVG OBP SLG
Since 2024Home .459 142 13 0 6 4 .191 .237 .221
Since 2024Away .670 139 16 1 10 4 .269 .350 .319
2026Home 0 0 0 0 0 0 0 0 0
2026Away 0 0 0 0 0 0 0 0 0
2025Home .542 93 11 0 4 3 .229 .289 .253
2025Away .710 82 9 1 8 3 .275 .363 .348
2024Home .310 49 2 0 2 1 .125 .143 .167
2024Away .613 57 7 0 2 1 .260 .333 .280
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Defensive Stats
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Stats Vs Upcoming Pitchers
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Past Fantasy Outlooks
2025
2024
2023
Across two seasons in Chicago, Mastrobuoni has turned into a serviceable utility player with limited offensive upside. The left-hand hitting batter appeared in 50 games for the Cubs in 2024 and posted a .194/.245/.224 slash line with no home runs. Mastrobuoni was a bit better in 2023, when he posted a .609 OPS and one long ball across 61 games while also swiping 13 bags in just 14 attempts. The 29-year-old can play pretty much anywhere in the field, and his speed is a useful asset when he's on base. However, he simply doesn't hit or play enough to really move the fantasy needle. Heading into 2025, Mastrobuoni will likely compete for an Opening Day bench spot, but he could also start the year with Triple-A Omaha. Injuries on the MLB roster could open up a larger role, though for now, Mastrobuoni isn't really a viable option.
Mastrobuoni saw his most extended run at the MLB level in 2023, and while his overall numbers weren't overly impressive, he did finish the season well. The 28-year-old finished with a .241/.308/.301 slash line with a home run and five RBI across 61 games. However, in the final month of the season he slashed .333/.353/.394 across 16 games, and he started to see more regular playing time as a result. Mastrobuoni's biggest contribution throughout the year was his speed, as he managed 13 stolen bases in only 14 attempts. And while he primarily played at third base, Mastrobuoni also saw time at shortstop, second base and in right field. Heading into 2024, it looks like Mastrobuoni could serve as a utility player with the Cubs due to the versatility he displayed last season. It might not be the most fantasy-friendly role, though Mastrobuoni showed he can have a little value when he sees the field, particularly because of his ability to swipe bases.
Mastrobuoni spent most of the season with Triple-A Durham, slashing .300/.377/.469 with 23 steals in 26 attempts. His exploits earned him a late September promotion. Unfortunately, Mastrobuoni struggled, fanning six times in 17 plate appearances. Undeterred, the Cubs traded for Mastrobuoni where he'll have a chance to win a reserve role in the spring. Mastrobuoni can play all three outfield positions as well as both middle infield spots. His versatility bodes well for a utility job, but beware, while his numbers with the Bulls were solid, he was 26 years old, a bit elderly for the level. Because he can run, Mastrobuoni is worth monitoring, but he has a lot to prove before showing up on the fantasy radar.
More Fantasy News
Suffered calf injury in WBC
3BSeattle Mariners
Calf
March 11, 2026
Mastrobuoni will return to Mariners camp after suffering a calf injury during Team Italy's win over Team USA in the World Baseball Classic on Tuesday, Bob Nightengale of USA Today reports.
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Smacks grand slam in spring debut
3BSeattle Mariners
February 22, 2026
Mastrobuoni went 2-for-2 with a double and a grand slam in Saturday's Cactus League matchup with the Giants.
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Recalled, starting in finale
3BSeattle Mariners
September 28, 2025
The Mariners recalled Mastrobuoni from Triple-A Tacoma on Sunday. He'll start at first base and bat ninth in the team's regular-season finale versus the Dodgers.
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Sent back to Triple-A
3BSeattle Mariners
August 18, 2025
The Mariners optioned Mastrobuoni to Triple-A Tacoma on Monday.
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Serving as 27th man
3BSeattle Mariners
August 17, 2025
The Mariners recalled Mastrobuoni from Triple-A Tacoma prior to Sunday's game against the Mets in Williamsport, Pa.
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Latest Fantasy Rumors
Could join big-league roster
3BChicago Cubs
June 18, 2024
Mastrobuoni is with the Cubs as a member of the taxi squad Tuesday as Mike Tauchman is banged up with a groin injury, reports Meghan Montemurro of the Chicago Tribune.
Analysis
Mastrobuoni may not be added to the big-league roster but is with the club as depth in case Tauchman is moved to the injured list. Mastrobuoni has a .125/.222/.150 slash line in 45 plate appearances with the Cubs this season and isn't likely to be relevant for fantasy managers even if active.
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