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William Kempner is a right-handed pitcher for the Miami Marlins. In MLB, William Kempner has appeared in 7 games (10.0 IP) with a 0.00 ERA and 9.90 strikeouts per nine. In AAA, William Kempner has appeared in 37 games (48.2 IP) with a 3.51 ERA and 14.24 strikeouts per nine.
The table below lists William Kempner's 46 most recent tracked appearances, newest first, with innings pitched, hits, earned runs, walks, and strikeouts. Each date links to the full game page.
| Date | Lvl | Opp | IP | H | ER | BB | K |
|---|---|---|---|---|---|---|---|
| Jul 11, 2026 | MLB | Cleveland Guardians | 2.0 | 3 | 2 | 0 | 3 |
| Jul 9, 2026 | MLB | Seattle Mariners | 0.1 | 2 | 2 | 2 | 0 |
| Jul 3, 2026 | MLB | Athletics | 1.0 | 0 | 0 | 0 | 1 |
| Jun 30, 2026 | AAA | Nashville Sounds | 1.0 | 2 | 1 | 0 | 1 |
| Jun 27, 2026 | AAA | Memphis Redbirds | 1.0 | 1 | 0 | 2 | 2 |
| Jun 25, 2026 | AAA | Memphis Redbirds | 1.0 | 0 | 0 | 1 | 1 |
| Jun 23, 2026 | AAA | Memphis Redbirds | 1.0 | 1 | 0 | 1 | 1 |
| Jun 20, 2026 | AAA | Durham Bulls | 2.0 | 1 | 0 | 1 | 1 |
| Jun 15, 2026 | MLB | Philadelphia Phillies | 2.1 | 0 | 0 | 0 | 2 |
| Jun 10, 2026 | MLB | Arizona Diamondbacks | 2.0 | 0 | 0 | 2 | 3 |
| Jun 5, 2026 | MLB | Tampa Bay Rays | 1.1 | 1 | 0 | 0 | 1 |
| May 31, 2026 | MLB | New York Mets | 1.1 | 2 | 0 | 0 | 3 |
| May 30, 2026 | MLB | New York Mets | 1.0 | 0 | 0 | 0 | 0 |
| May 26, 2026 | AAA | Charlotte Knights | 1.0 | 0 | 0 | 0 | 2 |
| May 22, 2026 | AAA | Norfolk Tides | 1.1 | 2 | 2 | 3 | 3 |
| May 20, 2026 | AAA | Norfolk Tides | 1.0 | 0 | 0 | 0 | 1 |
| May 17, 2026 | AAA | Memphis Redbirds | 2.0 | 0 | 0 | 1 | 1 |
| May 14, 2026 | AAA | Memphis Redbirds | 1.0 | 0 | 0 | 0 | 1 |
| May 12, 2026 | AAA | Memphis Redbirds | 2.0 | 0 | 0 | 0 | 1 |
| May 8, 2026 | AAA | Charlotte Knights | 2.0 | 0 | 0 | 1 | 3 |
| May 5, 2026 | MLB | Baltimore Orioles | 1.0 | 0 | 0 | 0 | 1 |
| May 1, 2026 | AAA | Durham Bulls | 2.0 | 0 | 0 | 0 | 2 |
| Apr 28, 2026 | AAA | Durham Bulls | 2.0 | 4 | 2 | 0 | 5 |
| Apr 24, 2026 | AAA | Gwinnett Stripers | 1.2 | 2 | 1 | 0 | 4 |
| Apr 22, 2026 | AAA | Gwinnett Stripers | 0.2 | 3 | 3 | 2 | 1 |
| Apr 19, 2026 | AAA | Charlotte Knights | 1.0 | 0 | 1 | 1 | 1 |
| Apr 16, 2026 | AAA | Charlotte Knights | 1.0 | 1 | 0 | 2 | 3 |
| Apr 10, 2026 | AAA | Norfolk Tides | 1.0 | 0 | 2 | 4 | 3 |
| Apr 7, 2026 | AAA | Norfolk Tides | 2.0 | 0 | 0 | 1 | 4 |
| Apr 4, 2026 | AAA | Sugar Land Space Cowboys | 1.1 | 0 | 0 | 0 | 3 |
| Apr 1, 2026 | AAA | Sugar Land Space Cowboys | 1.1 | 2 | 2 | 0 | 4 |
| Mar 29, 2026 | AAA | Rochester Red Wings | 0.2 | 0 | 0 | 0 | 2 |
| Mar 27, 2026 | AAA | Rochester Red Wings | 0.2 | 1 | 0 | 1 | 2 |
| Sep 21, 2025 | AAA | Norfolk Tides | 1.0 | 1 | 0 | 2 | 2 |
| Sep 19, 2025 | AAA | Norfolk Tides | 0.2 | 0 | 2 | 2 | 1 |
| Sep 13, 2025 | AAA | Memphis Redbirds | 3.0 | 0 | 0 | 3 | 4 |
| Sep 10, 2025 | AAA | Memphis Redbirds | 1.0 | 0 | 0 | 1 | 1 |
| Sep 6, 2025 | AAA | Charlotte Knights | 2.1 | 2 | 0 | 1 | 3 |
| Sep 2, 2025 | AAA | Charlotte Knights | 2.0 | 1 | 0 | 0 | 4 |
| Aug 28, 2025 | AAA | Rochester Red Wings | 0.1 | 0 | 0 | 0 | 1 |
| Aug 26, 2025 | AAA | Rochester Red Wings | 2.0 | 3 | 2 | 1 | 1 |
| Aug 24, 2025 | AAA | Worcester Red Sox | 1.0 | 0 | 0 | 2 | 1 |
| Aug 22, 2025 | AAA | Worcester Red Sox | 1.0 | 0 | 0 | 1 | 3 |
| Aug 17, 2025 | AAA | Norfolk Tides | 1.0 | 0 | 0 | 1 | 1 |
| Aug 14, 2025 | AAA | Norfolk Tides | 1.0 | 0 | 0 | 1 | 3 |
| Aug 12, 2025 | AAA | Norfolk Tides | 0.2 | 1 | 1 | 0 | 0 |