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Mark Leiter Jr.
MLB
About Mark Leiter Jr.
Mark Edward Leiter Jr. (born March 13, 1991) is an American professional baseball pitcher for the Athletics of Major League Baseball (MLB). He has previously played in MLB for the Philadelphia Phillies, Toronto Blue Jays, Chicago Cubs, and New York Yankees. Leiter played college baseball at the New Jersey Institute of Technology. He was selected by the Phillies in the 22nd round of the 2013 MLB draft, and made his MLB debut with them in 2017.
Bio summary from Wikipedia.
Player Stats
| W | 0 | L | 1 | ERA | 4.28 | G | 36 |
|---|---|---|---|---|---|---|---|
| GS | 0 | SV | 4 | IP | 33.2 | H | 33 |
| R | 16 | ER | 16 | BB | 11 | SO | 38 |
| WHIP | 1.307 | H/9 | 8.8 | HR/9 | 0.5 | BB/9 | 2.9 |
| K/9 | 10.2 | FIP | 2.95 | WAR | 0.6 |
2026 pitching — Baseball-Reference
Career — Lahman, through 2025
Batting
| Year | Team | G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017 | PHI | 27 | 25 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | .080 |
| 2018 | PHI | 12 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | .000 |
Pitching
| Year | Team | W | L | ERA | G | GS | CG | SHO | SV | IP | H | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017 | PHI | 3 | 6 | 4.96 | 27 | 11 | 0 | 0 | 0 | 90.2 | 90 | 18 | 31 | 84 |
| 2018 | PHI | 0 | 1 | 5.40 | 12 | 0 | 0 | 0 | 0 | 16.2 | 22 | 5 | 8 | 13 |
| 2018 | TOR | 0 | 0 | 13.50 | 8 | 0 | 0 | 0 | 0 | 6.2 | 13 | 2 | 4 | 9 |
| 2022 | CHN | 2 | 7 | 3.99 | 35 | 4 | 0 | 0 | 3 | 67.2 | 52 | 10 | 25 | 73 |
| 2023 | CHN | 1 | 3 | 3.50 | 69 | 0 | 0 | 0 | 4 | 64.1 | 48 | 7 | 24 | 77 |
| 2024 | CHN | 2 | 4 | 4.21 | 39 | 0 | 0 | 0 | 0 | 36.1 | 27 | 2 | 13 | 53 |
| 2024 | NYA | 2 | 1 | 4.98 | 21 | 0 | 0 | 0 | 0 | 21.2 | 28 | 6 | 9 | 33 |
| 2025 | NYA | 6 | 7 | 4.84 | 59 | 0 | 0 | 0 | 2 | 48.1 | 57 | 5 | 17 | 54 |
Season lines from the Lahman Baseball Database (Version 2025, via SABR), joined through the Chadwick Register ID crosswalk. The databank runs through the 2025 season — the current season is the 2026 line below, from the MLB Stats API.
2026 Season — MLB Stats API
Pitching
| W | L | ERA | G | GS | CG | SHO | SV | IP | H | R | ER | HR | BB | SO | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 4.28 | 36 | 0 | 0 | 0 | 4 | 33.2 | 33 | 16 | 16 | 2 | 11 | 38 | 1.31 |
2026 regular-season line from the MLB Stats API (statsapi.mlb.com), pulled when this page was built. Multi-team stints are combined; rate stats are recomputed from the combined totals.
Watch Mark Leiter Jr. Highlights
“Mark Leiter Jr. 2026 MLB Highlights!” · Open on YouTube · More Mark Leiter Jr. videos