Gregory Santos

Gregory Santos

25-Year-Old PitcherRP
Seattle Mariners
2024 Stats
W-L
0-1
ERA
4.91
WHIP
1.09
K
6
SV
0
2025 Projections
W-L
ERA
WHIP
K
SV
Unlock Our Projections
2025 Fantasy Outlook
Santos was acquired by Seattle to deepen its bullpen prior to the 2024 season, but a variety of injuries limited Santos to just over seven innings of work on the season. He missed two months with right bicep inflammtion related to a nerve issue and previously missed over three months with a severe lat strain. This all came on the heels of his 2023 season ending early with right elbow inflammation. To be sure, strains and inflammations are the last thing you want to see from a hard throwing reliever, especially one so reliant upon a dastardly slider. The lost time and injury risk has likely led to Santos moving down from the primary setup man or potential closer to someone more likely to work in specific leverage situations against righty-heavy lineups unless something changes with his repertoire and his health. The Seattle bullpen is not exactly set it stone, so anything is possible if Santos's body doesn't let him down once again. Read Past Outlooks
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League Majors
Bats R
Throws R
40 Man Yes
Height 6'2"
Weight 190
DOB 8/28/1999
Drafted 2015
$Signed a one-year contract with the Mariners in March of 2024.
Wraps '24 with scoreless efforts
PSeattle Mariners
September 30, 2024
Santos, who was activated from the injured list last Monday, subsequently made two relief appearances during which he fired two scoreless innings while allowing one hit and recording one strikeout.
ANALYSIS
Santos got back on the bump at the major-league level for the first time since July 31 when he earned his second hold with a scoreless seventh inning in the series opener against the Athletics on Friday. He logged one more frame during Sunday's regular-season finale, getting through the eighth inning on just nine pitches. It was a modest but encouraging season-ending sample for Santos, who didn't make his 2024 debut until July due to a lat strain and then missed nearly two months with a biceps injury. The hard-throwing right-hander played on a one-year deal this season, and it remains to be seen if the Mariners will want to take another look considering Santos logged all of 7.1 innings across eight appearances due to the injuries.
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Pitching Stats
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2024
2023
2022
2021
2024 MLB Game Log
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2023 MLB Game Log
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2022 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
14
Last 10 Games
14
Last 5 Games
15
How many pitches does Gregory Santos generally throw?
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
What part of the game does Gregory Santos generally pitch?
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2022
Even Split
2024
 
 
-68%
BAA vs RHP
2023
 
 
-8%
BAA vs LHP
2022
 
 
-33%
BAA vs LHP
BAA Batters K BB H 2B 3B HR
Since 2022vs Left .255 150 40 10 35 4 1 0
Since 2022vs Right .254 187 34 11 44 7 0 2
2024vs Left .385 14 4 1 5 2 0 0
2024vs Right .125 17 2 0 2 0 0 0
2023vs Left .246 127 35 6 29 2 1 0
2023vs Right .268 162 31 11 40 6 0 2
2022vs Left .167 9 1 3 1 0 0 0
2022vs Right .250 8 1 0 2 1 0 0
More Splits→ View More Split Stats
Home/Away Pitching Splits
Since 2022
 
 
-6%
ERA at Home
2024
 
 
-60%
ERA on Road
2023
 
 
-5%
ERA at Home
2022
 
 
-100%
ERA at Home
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2022Home 3.51 1.15 41.0 1 1 3 8.1 1.5 0.0
Since 2022Away 3.72 1.46 36.1 1 2 2 9.2 3.5 0.5
2024Home 6.75 1.25 4.0 0 1 0 4.5 0.0 0.0
2024Away 2.70 0.90 3.1 0 0 0 10.8 2.7 0.0
2023Home 3.31 1.19 35.1 1 0 3 8.7 1.8 0.0
2023Away 3.48 1.42 31.0 1 2 2 9.3 2.9 0.6
2022Home 0.00 0.00 1.2 0 0 0 5.4 0.0 0.0
2022Away 9.00 3.00 2.0 0 0 0 4.5 13.5 0.0
More Splits→ View More Split Stats
Stat Review
How does Gregory Santos 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
6.00
 
K/9
7.4
 
BB/9
1.2
 
HR/9
0.0
 
Fastball
98.0 mph
 
ERA
4.91
 
WHIP
1.09
 
BABIP
.323
 
GB/FB
2.33
 
Left On Base
50.0%
 
Exit Velocity
80.5 mph
 
Barrels/BBE
8.5%
 
Spin Rate
2487 rpm
 
Balls Hit 95+ MPH
25.5%
 
Swinging Strike
9.8%
 
Prospect Rankings History
View Complete Gregory Santos Prospect Ranking History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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2024 Fantasy Outlook
Santos was designated for assignment by San Francisco last off-season, only to be acquired by the White Sox soon afterwards. Despite having minimal experience at the big-league level, the hard-throwing right-hander made Chicago's opening day bullpen. He spent the first two months working in low leverage, but his solid body of work, good control (5.9% walk rate) and excellent slider (.196 BA, 37.5% whiff rate) earned him higher-leverage opportunities as the season went on. The 24-year-old converted his first save in early July, then stepped into closing duties once Chicago unloaded their veteran relievers at the trade deadline. Santos totaled five saves before right elbow inflammation ended his season in mid-September. He was expected to open 2024 as the White Sox's primary closer but was dealt to Seattle in early February, where he likely won't have much fantasy value in a significantly better bullpen.
More Fantasy News
Activated from IL
PSeattle Mariners
September 23, 2024
The Mariners reinstated Santos (biceps) from the 15-day injured list Monday, Daniel Kramer of MLB.com reports.
ANALYSIS
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Two more scoreless rehab outings
PSeattle Mariners
Biceps
September 23, 2024
Santos (biceps) continued his rehab assignment with Triple-A Tacoma with one-inning scoreless appearances Wednesday and Saturday, allowing one hit and two walks while recording a strikeout over that span.
ANALYSIS
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Another rehab appearance Sunday
PSeattle Mariners
Biceps
September 16, 2024
Santos (bicep) retired two batters and issued two walks in a rehab appearance for Triple-A Tacoma on Sunday.
ANALYSIS
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Completes third rehab outing
PSeattle Mariners
Biceps
September 14, 2024
Santos (biceps) allowed an earned run on a walk over two-thirds of an inning in Triple-A Tacoma's win over Oklahoma City on Friday. He struck out two.
ANALYSIS
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Clean inning with Tacoma
PSeattle Mariners
Biceps
September 12, 2024
Santos (biceps) fired a scoreless sixth inning in Triple-A Tacoma's extra-inning loss to Oklahoma City on Tuesday, allowing two walks and recording a strikeout.
ANALYSIS
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