Isaac Mattson
Pitcher · Career Stats, Bio & Records (2021-2026)
Isaac Mattson is a pitcher who has played in Major League Baseball since 2021 for the Baltimore Orioles and the Pittsburgh Pirates, a span of 6 seasons. Across 89 career appearances, he has gone 3-3 with a 3.94 ERA and 90 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 600.3.
- 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" / 205 lb
- MLB Debut
- 2021-05-07
Full name: Isaac Gerald Mattson
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 | BAL | AL | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 4.1 | 5 | 3 | 5 | 3 | 6.23 | — | 0.0 |
| 2024 | PIT | NL | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 5.1 | 1 | 3 | 5 | 6 | 5.06 | — | 0.0 |
| 2025 | PIT | NL | 3 | 3 | 44 | 0 | 0 | 0 | 0 | 47.2 | 35 | 13 | 19 | 45 | 2.45 | 4.16 (+41%) | 600.3 |
| 2026 | PIT | NL | 0 | 0 | 38 | 0 | 0 | 0 | 0 | 38.2 | 44 | 23 | 18 | 36 | 5.35 | 4.18 (-28%) | - |
| Career · 4 seasons | 3 | 3 | 89 | 0 | 0 | 0 | 0 | 96.0 | 85 | 42 | 47 | 90 | 3.94 | — | 600 | ||
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 | BAL | AL | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2024 | PIT | NL | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2025 | PIT | NL | 44 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| Career · 3 seasons | 51 | 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 (102 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 25 | 0 | 0 | 0 | 0 | 0 | — |
| Away | 26 | 0 | 0 | 0 | 0 | 0 | — |
Pitching — Home / Away
| Split | G | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Home | 25 | 25.0 | 18 | 12 | 17 | 27 | 4.32 |
| Away | 26 | 32.1 | 23 | 7 | 12 | 27 | 1.95 |
Last 10 Games — Pitching
| Date | Tm | Opp | Dec | IP | H | R | ER | BB | SO | HR |
|---|---|---|---|---|---|---|---|---|---|---|
| 2025-09-26 | PIT | ATL | — | 1.0 | 2 | 1 | 1 | 0 | 0 | 0 |
| 2025-09-24 | PIT | CIN | — | 0.2 | 1 | 1 | 1 | 1 | 0 | 1 |
| 2025-09-23 | PIT | CIN | — | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2025-09-19 | PIT | OAK | — | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2025-09-14 | PIT | WAS | L | 2.0 | 1 | 1 | 0 | 1 | 1 | 0 |
| 2025-09-10 | PIT | BAL | — | 1.0 | 3 | 1 | 1 | 0 | 0 | 0 |
| 2025-09-09 | PIT | BAL | — | 1.0 | 0 | 0 | 0 | 2 | 1 | 0 |
| 2025-09-07 | PIT | MIL | — | 1.0 | 0 | 0 | 0 | 2 | 1 | 0 |
| 2025-09-03 | PIT | LAD | — | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 2025-09-02 | PIT | LAD | — | 1.0 | 3 | 2 | 2 | 0 | 0 | 0 |
Fielding Statistics
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Pitcher | 51 |
Isaac Mattson: the record in brief
Isaac Mattson made a major league debut on May 7, 2021 and is still active, so the totals on this page keep changing. The team column moves through the Baltimore Orioles (2021) and the Pittsburgh Pirates (2024 to 2025). Born on July 14, 1995, in Erie, PA, USA, Mattson is listed as a pitcher and batted and threw right-handed. Size on record: 205 pounds on a 6-foot-2 frame. Isaac Mattson was the playing name; the full given name is Isaac Gerald.
The pitching table credits Mattson with a 3-3 record and a 3.94 ERA in 89 games. Mattson has 90 strikeouts. That 3.94 ERA compares with a 4.17 league average across the same seasons, 5.6% better. Among the heaviest workloads, the lowest ERA was 2.45 in 2025, when the league's was 4.16. Pitcher PIV, the site's era-adjusted run-prevention measure, totals 600.3 for Mattson's career.
Every defensive appearance on record for Mattson, 51 games, came at pitcher. Fielding on the mound produced 2 putouts and 8 assists against 1 errors.
Retrosheet box scores cover 102 of Mattson's games, and the full game log is linked from the splits section.
Frequently Asked Questions about Isaac Mattson
- What years did Isaac Mattson play?
- Isaac Mattson played in Major League Baseball from 2021 to 2026.
- Was Isaac Mattson a pitcher?
- Yes. Isaac Mattson pitched in the major leagues, recording 3 wins and 90 strikeouts.
- What was Isaac Mattson's career ERA?
- Isaac Mattson finished with a 3.94 career ERA, going 3-3 with 90 strikeouts.
- How many strikeouts did Isaac Mattson have?
- Isaac Mattson recorded 90 career strikeouts.
- Is Isaac Mattson in the Hall of Fame?
- No. Isaac Mattson has not been inducted into the National Baseball Hall of Fame.
- What teams did Isaac Mattson play for?
- Isaac Mattson played for the Baltimore Orioles and the Pittsburgh Pirates.