All Players › Mark Leiter Jr.
Mark Leiter Jr. was a Major League Baseball pitcher, born March 13, 1991 in Fort Lauderdale, FL. A right-handed pitcher listed at 6' 0" and 210 pounds, Mark Leiter debuted on April 28, 2017.
Across 306 big-league appearances, Mark Leiter went 16-30 with a 4.57 ERA, 434 strikeouts, and 386.0 innings pitched.
Every one of Mark's Athletics seasons is listed below. Explore more through the franchise history, the rosters by year, and the full player index.
Career pitching totals across 306 appearances, and the year-by-year line. Figures from the MLB Stats API.
| W | L | ERA | G | GS | SV | IP | SO | BB | WHIP |
|---|---|---|---|---|---|---|---|---|---|
| 16 | 30 | 4.57 | 306 | 15 | 13 | 386.0 | 434 | 142 | 1.33 |
| Year | Team | W | L | ERA | IP | SO |
|---|---|---|---|---|---|---|
| 2017 | Philadelphia Phillies | 3 | 6 | 4.96 | 90.2 | 84 |
| 2018 | Philadelphia Phillies | 0 | 1 | 5.40 | 16.2 | 13 |
| 2018 | Toronto Blue Jays | 0 | 0 | 13.50 | 6.2 | 9 |
| 2018 | ? | 0 | 1 | 7.71 | 23.1 | 22 |
| 2022 | Chicago Cubs | 2 | 7 | 3.99 | 67.2 | 73 |
| 2023 | Chicago Cubs | 1 | 3 | 3.50 | 64.1 | 77 |
| 2024 | Chicago Cubs | 2 | 4 | 4.21 | 36.1 | 53 |
| 2024 | New York Yankees | 2 | 1 | 4.98 | 21.2 | 33 |
| 2024 | ? | 4 | 5 | 4.50 | 58.0 | 86 |
| 2025 | New York Yankees | 6 | 7 | 4.84 | 48.1 | 54 |
| 2026 | Athletics | 0 | 1 | 4.28 | 33.2 | 38 |
With the Athletics franchise, Mark Leiter appears across the 2026 season (Athletics).
In an Athletics uniform, Mark Leiter pitched in 36 games with 38 strikeouts. Every A's season is captured on the franchise rosters below.
Mark Leiter Jr. is part of the active Athletics era (2026), the roster carrying the franchise through Sacramento toward its future home in Las Vegas. Fans following the relocation can track the current squad on the 2026 roster.
Players who shared a franchise roster with Mark Leiter Jr..
Built from franchise roster data (MLB Stats API). LV Athletics is an independent fan site and is not affiliated with the Athletics or Major League Baseball.