Reiver Sanmartin

Reiver Sanmartin

29-Year-Old PitcherRP
San Francisco Giants
60-Day IL
Injury Hip
Est. Return 6/9/2026
2026 Fantasy Outlook
There was no outlook written for Reiver Sanmartin in 2026. Check out the latest news below for more on his current fantasy value.
Signed a one-year contract with the Giants in March of 2026.
Goes on 60-day injured list
PSan Francisco Giants
Hip
March 25, 2026
The Giants placed Sanmartin (hip) on the 60-day injured list Wednesday.
Analysis
The southpaw will be sidelined until June after suffering a right hip flexor strain earlier this month. Even when healthy, Sanmartin is not a lock to return to the active roster with the big club.
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Pitching Stats
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2026 MLB Game Log
2026
2025
2023
2022
2021
2026 MLB Game Log
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2025 MLB Game Log
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2023 MLB Game Log
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2022 MLB Game Log
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2021 MLB Game Log
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Left/Right Pitching Splits
Since 2024
 
 
-100%
BAA vs LHP
2026
No Stats
2025
 
 
-100%
BAA vs LHP
2024
No Stats
BAA Batters K BB H 2B 3B HR
Since 2024vs Left .000 1 0 0 0 0 0 0
Since 2024vs Right .333 7 2 1 2 1 0 0
2026vs Left 0 0 0 0 0 0 0 0
2026vs Right 0 0 0 0 0 0 0 0
2025vs Left .000 1 0 0 0 0 0 0
2025vs Right .333 7 2 1 2 1 0 0
2024vs Left 0 0 0 0 0 0 0 0
2024vs Right 0 0 0 0 0 0 0 0
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Home/Away Pitching Splits
Since 2024
No Stats
2026
No Stats
2025
No Stats
2024
No Stats
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2024Home 0.00 1.80 1.2 0 0 0 10.8 5.4 0.0
Since 2024Away 0 0 0 0 0 0 0 0 0
2026Home 0 0 0 0 0 0 0 0 0
2026Away 0 0 0 0 0 0 0 0 0
2025Home 0.00 1.80 1.2 0 0 0 10.8 5.4 0.0
2025Away 0 0 0 0 0 0 0 0 0
2024Home 0 0 0 0 0 0 0 0 0
2024Away 0 0 0 0 0 0 0 0 0
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Stat Review
How does Reiver Sanmartin compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. 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, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in 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.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
2.00
 
K/9
10.8
 
BB/9
5.4
 
HR/9
0.0
 
Fastball
92.9 mph
 
ERA
0.00
 
WHIP
1.80
 
BABIP
.426
 
GB/FB
3.00
 
Left On Base
66.7%
 
Exit Velocity
81.2 mph
 
Barrels/BBE
10.0%
 
Spin Rate
1996 rpm
 
Balls Hit 95+ MPH
20.0%
 
Swinging Strike
7.4%
 
Prospect Rankings History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Recent RotoWire Articles Featuring Reiver Sanmartin See More
Recent RotoWire Articles Featuring Reiver Sanmartin See More
Past Fantasy Outlooks
2023
2022
Sanmartin was utterly dreadful in four starts for the Reds last season. He put up a 19.85 ERA and 3.09 WHIP in those outings, with batters hitting .456 with a 1.294 OPS against the left-hander. Sanmartin was much better in relief, though, with a 2.96 ERA over 41 appearances while limiting them to a .694 OPS. The southpaw's drastic platoon splits (.717 OPS versus left-handed batters, .933 OPS against right-handers) also point to the bullpen being his long-term home. Sanmartin currently projects as the lone lefty in manager David Bell's relief corps, so he could find himself in high-leverage spots when the situation calls for it.
Sanmartin is still a bit of an unknown in many circles, but he had a 3.94 ERA, 54.0 GB% and 19.2 K-BB% in 82.1 innings at Triple-A and then finished his season with two strong starts in the majors. Of course, it helped that both of those starts came against the Pirates. The 25-year-old lefty only averaged 89.5 mph on his fourseam fastball, but it had serious horizontal break and was very tough to pick up from a three-quarters lefty slot. His slider and changeup are strong secondary offerings, so it's a starter's repertoire. Given the lack of velocity, we recommend treading cautiously, as deception artists often have a short shelf life in the majors. However, Sanmartin has a decent chance of opening the year with a spot in the Reds' starting rotation, and he has a good recent statistical track record.
More Fantasy News
Sidelined three months
PSan Francisco Giants
Hip
March 9, 2026
Sanmartin will be sidelined for three months after being diagnosed Monday with a severe right hip flexor strain, Susan Slusser of the San Francisco Chronicle reports.
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Battling quad injury
PSan Francisco Giants
Quadriceps
March 4, 2026
Sanmartin suffered a minor quadriceps strain during a recent exhibition game appearance for Team Colombia, Susan Slusser of the San Francisco Chronicle reports.
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Headed to San Francisco
PSan Francisco Giants
November 6, 2025
The Giants claimed Sanmartin off waivers from the Reds on Thursday, Alex Pavlovic of NBC Sports Bay Area reports.
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Jettisoned to minors
PCincinnati Reds
September 3, 2025
The Reds optioned Sanmartin to Triple-A Louisville on Wednesday.
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Contract selected
PCincinnati Reds
September 2, 2025
The Reds selected Sanmartin's contract from Triple-A Louisville on Tuesday, Charlie Goldsmith of Fox 19 Now Cincinnati reports.
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