Gregory Santos
Pitcher · Career Stats, Bio & Records (2021-2026)
Gregory Santos is a pitcher who has played in Major League Baseball since 2021 for the San Francisco Giants, the Chicago White Sox, and the Seattle Mariners, a span of 6 seasons. Across 84 career appearances, he has gone 3-6 with a 4.14 ERA and 78 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 2823.5.
- W (Wins):
- Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
- ERA (Earned Run Average):
- Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
- SO (Strikeouts):
- For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
- WHIP (Walks and Hits per Inning Pitched):
- Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.
Data updated
- Position
- Pitcher
- Bats / Throws
- R / R
- Height / Weight
- 6'2" / 190 lb
- MLB Debut
- 2021-04-22
- Jersey
- #57
Full name: Gregory Omar Santos
Season-by-Season Pitching
Click a stat to plot it across every season.
| Year | Team | Lg | W | L | G | GS | CG | SHO | SV | IP | H | ER | BB | SO | ERA | Lg ERA | Pitcher PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | SFN | NL | 0 | 2 | 3 | 0 | 0 | 0 | 0 | 2.0 | 5 | 5 | 2 | 3 | 22.50 | — | 0.0 |
| 2022 | SFN | NL | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 3.2 | 3 | 2 | 3 | 2 | 4.91 | — | 0.0 |
| 2023 | CHA | AL | 2 | 2 | 60 | 0 | 0 | 0 | 5 | 66.1 | 69 | 25 | 17 | 66 | 3.39 | 4.33 (+22%) | 2823.5 |
| 2024 | SEA | AL | 0 | 1 | 8 | 0 | 0 | 0 | 0 | 7.1 | 7 | 4 | 1 | 6 | 4.91 | — | 0.0 |
| 2025 | SEA | AL | 1 | 1 | 8 | 0 | 0 | 0 | 0 | 7.0 | 8 | 4 | 8 | 0 | 5.14 | — | 0.0 |
| 2026 | SF | NL | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 5.0 | 5 | 2 | 3 | 1 | 3.60 | — | - |
| Career · 6 seasons | 3 | 6 | 84 | 0 | 0 | 0 | 5 | 91.1 | 97 | 42 | 34 | 78 | 4.14 | — | 2,824 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Season-by-Season Batting
Click a stat to plot it across every season.
| Year | Team | Lg | G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | Lg AVG | Lg OBP | Lg SLG | Lg OPS | PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | SFN | NL | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2022 | SFN | NL | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2023 | CHA | AL | 60 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2024 | SEA | AL | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2025 | SEA | AL | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| Career · 5 seasons | 81 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | — | 0 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Game Log & Splits
View full game log (162 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 42 | 0 | 0 | 0 | 0 | 0 | — |
| Away | 39 | 0 | 0 | 0 | 0 | 0 | — |
Pitching — Home / Away
| Split | G | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Home | 42 | 48.0 | 50 | 22 | 12 | 40 | 4.12 |
| Away | 39 | 38.1 | 42 | 18 | 19 | 37 | 4.23 |
Last 10 Games — Pitching
| Date | Tm | Opp | Dec | IP | H | R | ER | BB | SO | HR |
|---|---|---|---|---|---|---|---|---|---|---|
| 2025-04-15 | SEA | CIN | — | 0.1 | 1 | 2 | 2 | 3 | 0 | 0 |
| 2025-04-12 | SEA | TEX | — | 1.0 | 2 | 1 | 1 | 0 | 0 | 0 |
| 2025-04-07 | SEA | HOU | W | 1.0 | 1 | 2 | 0 | 2 | 0 | 0 |
| 2025-04-06 | SEA | SFG | L | 0.2 | 1 | 1 | 1 | 1 | 0 | 0 |
| 2025-04-04 | SEA | SFG | — | 1.0 | 1 | 0 | 0 | 1 | 0 | 0 |
| 2025-04-01 | SEA | DET | — | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2025-03-30 | SEA | OAK | — | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2025-03-28 | SEA | OAK | — | 1.0 | 1 | 0 | 0 | 1 | 0 | 0 |
| 2024-09-29 | SEA | OAK | — | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 2024-09-27 | SEA | OAK | — | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 |
Fielding Statistics
Career Fielding Totals by Position
Season-by-Season Fielding
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Pitcher | 81 |
Gregory Santos: the record in brief
Gregory Santos's major league record starts with the debut on April 22, 2021 and remains open, because the career is ongoing. By club, Santos's seasons break down as the San Francisco Giants (2021 to 2022), the Chicago White Sox (2023), and the Seattle Mariners (2024 through 2025). Born on August 28, 1999, in San Cristobal, San Cristóbal, D.R., Santos is listed as a pitcher and batted and threw right-handed. Size on record: 6-foot-2 and 190 pounds. Gregory Santos was the playing name; the full given name is Gregory Omar.
Santos has pitched in 84 games, starting 0, and owns a 3-6 record and 4.14 ERA. The same table counts 78 strikeouts. Santos's 4.14 ERA was close to the 4.16 league figure for those seasons. In 2023, one of the busiest seasons, Santos posted a 3.39 ERA; the league figure that year was 4.33. Pitcher PIV, the site's era-adjusted run-prevention measure, totals 2,823.5 for Santos's career.
The position breakdown shows 81 games, all at pitcher. On the mound, Santos's fielding totals are 5 putouts, 9 assists and 0 errors.
The game-log section draws on 162 games of Retrosheet box scores for Santos.
Frequently Asked Questions about Gregory Santos
- What years did Gregory Santos play?
- Gregory Santos played in Major League Baseball from 2021 to 2026.
- Was Gregory Santos a pitcher?
- Yes. Gregory Santos pitched in the major leagues, recording 3 wins and 78 strikeouts.
- What teams has Gregory Santos played for?
- Gregory Santos has played for 3 teams: the San Francisco Giants (2021–2022, 2026), the Chicago White Sox (2023), and the Seattle Mariners (2024–2025).
- What are Gregory Santos's career stats?
- In 84 games, Gregory Santos has gone 3-6 with a 4.14 ERA, 78 strikeouts, 91.1 innings pitched, and 5 saves.
- What position does Gregory Santos play?
- Gregory Santos plays primarily as a pitcher, the position where he has appeared in the most games.
- How tall is Gregory Santos and how much does he weigh?
- Gregory Santos is listed at 6 feet 2 inches and 190 pounds.
- What number does Gregory Santos wear?
- Gregory Santos wears number 57, according to MLB's 2026 roster data.
- What was Gregory Santos's career ERA?
- Gregory Santos finished with a 4.14 career ERA, going 3-6 with 78 strikeouts.
- How many strikeouts did Gregory Santos have?
- Gregory Santos recorded 78 career strikeouts.