| W | L | ERA | G | GS | SV | IP | SO | WHIP | |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 3 | 0 | 2.65 | 13 | 0 | 1 | 17 | 25 | 1.35 |
| Career Minors | 12 | 8 | 3.10 | 91 | 7 | 8 | 139.1 | 184 | 1.26 |
| G | W-L | ERA | IP | SO | WHIP | |
|---|---|---|---|---|---|---|
| 2025 | 13 | 3-0 | 2.65 | 17 | 25 | 1.35 |
| Career Minors | 91 | 12-8 | 3.10 | 139.1 | 184 | 1.26 |
| Season | Tm | LG | L | W | L | ERA | G | GS | SV | IP | H | R | ER | HR | BB | SO | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 2 Teams | Minors | 1 | 0 | 5.00 | 5 | 2 | 0 | 9.0 | 10 | 5 | 5 | 1 | 6 | 11 | 1.78 | |
| 2022 | ACL Giants Black | ACL | ROK | 1 | 0 | 2.70 | 2 | 0 | 0 | 3.1 | 4 | 1 | 1 | 0 | 2 | 5 | 1.80 |
| 2022 | San Jose Giants | CAL | A | 0 | 0 | 6.35 | 3 | 2 | 0 | 5.2 | 6 | 4 | 4 | 1 | 4 | 6 | 1.76 |
| 2023 | 3 Teams | Minors | 4 | 5 | 3.73 | 38 | 5 | 1 | 62.2 | 52 | 34 | 26 | 5 | 30 | 78 | 1.31 | |
| 2023 | San Jose Giants | CAL | A | 1 | 3 | 4.67 | 14 | 5 | 1 | 27.0 | 21 | 18 | 14 | 0 | 15 | 29 | 1.33 |
| 2023 | Eugene Emeralds | NWL | A+ | 3 | 2 | 2.91 | 23 | 0 | 0 | 34.0 | 28 | 15 | 11 | 5 | 13 | 47 | 1.21 |
| 2023 | Richmond Flying Squirrels | EAS | AA | 0 | 0 | 5.40 | 1 | 0 | 0 | 1.2 | 3 | 1 | 1 | 0 | 2 | 2 | 3.00 |
| 2025 | 3 Teams | Minors | 7 | 3 | 2.26 | 48 | 0 | 7 | 67.2 | 38 | 20 | 17 | 2 | 40 | 95 | 1.15 | |
| 2025 | Beloit Sky Carp | MID | A+ | 1 | 2 | 3.04 | 19 | 0 | 6 | 26.2 | 19 | 11 | 9 | 0 | 10 | 39 | 1.09 |
| 2025 | Pensacola Blue Wahoos | SOU | AA | 3 | 1 | 1.13 | 16 | 0 | 0 | 24.0 | 11 | 4 | 3 | 0 | 15 | 31 | 1.08 |
| 2025 | Jacksonville Jumbo Shrimp | INT | AAA | 3 | 0 | 2.65 | 13 | 0 | 1 | 17.0 | 8 | 5 | 5 | 2 | 15 | 25 | 1.35 |
| ACL Giants | ACL | ROK | 1 | 0 | 2.70 | 2 | 0 | 0 | 3.1 | 4 | 1 | 1 | 0 | 2 | 5 | 1.80 | |
| Jacksonville Jumbo Shrimp | INT | AAA | 3 | 0 | 2.65 | 13 | 0 | 1 | 17.0 | 8 | 5 | 5 | 2 | 15 | 25 | 1.35 | |
| 2 Teams | AA | 3 | 1 | 1.40 | 17 | 0 | 0 | 25.2 | 14 | 5 | 4 | 0 | 17 | 33 | 1.21 | ||
| 2 Teams | A+ | 4 | 4 | 2.97 | 42 | 0 | 6 | 60.2 | 47 | 26 | 20 | 5 | 23 | 86 | 1.15 | ||
| San Jose Giants | CAL | A | 1 | 3 | 4.96 | 17 | 7 | 1 | 32.2 | 27 | 22 | 18 | 1 | 19 | 35 | 1.41 | |
| Career Minors | 7 Teams | 12 | 8 | 3.10 | 91 | 7 | 8 | 139.1 | 100 | 59 | 48 | 8 | 76 | 184 | 1.26 |
| Team | Date | Transaction |
|---|---|---|
|
|
11/18/2025 | Miami Marlins selected the contract of RHP William Kempner from Jacksonville Jumbo Shrimp. |
|
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08/12/2025 | RHP William Kempner assigned to Jacksonville Jumbo Shrimp from Pensacola Blue Wahoos. |
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06/10/2025 | RHP William Kempner assigned to Pensacola Blue Wahoos from Beloit Sky Carp. |
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06/10/2025 | Pensacola Blue Wahoos activated RHP William Kempner. |
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04/03/2025 | RHP William Kempner assigned to Beloit Sky Carp from Pensacola Blue Wahoos. |
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02/28/2025 | RHP William Kempner assigned to Miami Marlins. |
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01/15/2025 | San Francisco Giants traded RHP William Kempner to Miami Marlins for Future Considerations. International Bonus Pool Money. |
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01/15/2025 | RHP William Kempner assigned to Pensacola Blue Wahoos. |
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11/03/2024 | Richmond Flying Squirrels activated RHP William Kempner. |
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09/25/2024 | RHP William Kempner assigned to Scottsdale Scorpions. |
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08/09/2024 | Richmond Flying Squirrels transferred RHP William Kempner from the 7-day injured list to the 60-day injured list. |
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04/05/2024 | Richmond Flying Squirrels placed RHP William Kempner on the 7-day injured list. |
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09/16/2023 | RHP William Kempner assigned to Richmond Flying Squirrels from Eugene Emeralds. |
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09/16/2023 | Richmond Flying Squirrels activated RHP William Kempner. |
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06/13/2023 | RHP William Kempner assigned to Eugene Emeralds from San Jose Giants. |
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06/13/2023 | Eugene Emeralds activated RHP William Kempner. |
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08/30/2022 | RHP William Kempner assigned to San Jose Giants from ACL Giants Black. |
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08/11/2022 | RHP William Kempner assigned to ACL Giants Black. |
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07/28/2022 | San Francisco Giants signed RHP William Kempner. |
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06/11/2022 | College Workout activated RHP William Kempner. |
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06/11/2022 | RHP William Kempner assigned to College Workout. |
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03/17/2022 | Gonzaga Bulldogs activated RHP William Kempner. |
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03/17/2022 | RHP William Kempner assigned to Gonzaga Bulldogs. |