Age: 34, 210 lbs, 6'0" Born: 3/13/1991, Fort Lauderdale, FL, USA Sal: N/A TRANSACTION REPORT 1 monthAgrees to terms with Athletics. The Athletics signed Leiter to a one-year, $3 million contract.
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| 2025 | ATH | 59 | 0 | 48.3 | 4.84 | 6 | 7 | 0 | 2 | 57 | 10 | 1 | 5 | 54 | 4 | 17 | 8 | 0 | 31 | 26 | 0 | 1.53 | 10.06 | 36.0 | 0.6 |
| 2024 | NYY | 60 | 0 | 58.0 | 4.50 | 4 | 5 | 0 | 0 | 55 | 9 | 1 | 8 | 86 | 3 | 22 | 5 | 0 | 34 | 29 | 0 | 1.33 | 13.34 | 20.0 | 0.3 |
| 2023 | CHC | 69 | 0 | 64.3 | 3.50 | 1 | 3 | 0 | 4 | 48 | 12 | 2 | 7 | 77 | 8 | 24 | 2 | 1 | 27 | 25 | 0 | 1.12 | 10.77 | 17.0 | 0.2 |
| 2022 | CHC | 35 | 0 | 67.7 | 3.99 | 2 | 7 | 0 | 3 | 52 | 7 | 2 | 10 | 73 | 7 | 25 | 5 | 0 | 32 | 30 | 0 | 1.14 | 9.71 | 19.0 | 0.5 |
| 2018 | TOR | 20 | 0 | 23.3 | 7.71 | 0 | 1 | 0 | 0 | 35 | 0 | 0 | 7 | 22 | 2 | 12 | 2 | 0 | 28 | 20 | 0 | 2.01 | 8.49 | 0.0 | 0.0 |
| 2017 | PHI | 27 | 0 | 90.7 | 4.96 | 3 | 6 | 0 | 0 | 90 | 0 | 0 | 18 | 84 | 7 | 31 | 3 | 0 | 59 | 50 | 0 | 1.33 | 8.34 | 15.0 | 0.6 |
| | | 270 | 0 | 352.3 | 4.92 | 16 | 29 | 0 | 9 | 337 | 38 | 6 | 55 | 396 | 31 | 131 | 25 | 1 | 211 | 180 | 0 | 1.41 | 10.12 | 107.0 | 0.4 |
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| 9/26/2025 | | L4 - 8 | 0 | 0.7 | 0.00 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 3.00 | 13.50 | 0.0 |
| 9/19/2025 | | L2 - 4 | 0 | 1.0 | 0.00 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.00 | 9.00 | 0.0 |
| 9/16/2025 | | W10 - 9 | 0 | 1.7 | 0.00 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.60 | 0.00 | 5.0 |
| 9/14/2025 | | L4 - 6 | 0 | 1.0 | 0.00 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.00 | 0.00 | 0.0 |
| 9/10/2025 | | W11 - 1 | 0 | 0.3 | 27.00 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 6.00 | 27.00 | 0.0 |
| 9/9/2025 | | W12 - 2 | 0 | 0.0 | - | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 4 | 4 | 0 | - | - | 0.0 |
| 9/5/2025 | | W7 - 1 | 0 | 1.0 | 9.00 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 2 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 2.00 | 18.00 | 0.0 |
| 8/28/2025 | | W10 - 4 | 0 | 1.0 | 0.00 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.00 | 9.00 | 0.0 |
| 8/25/2025 | | L5 - 10 | 0 | 0.3 | 27.00 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 3.00 | 27.00 | 0.0 |
| 8/22/2025 | | W1 - 0 | 0 | 1.0 | 9.00 | 0 | 1 | 0 | 0 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 2.00 | 0.00 | 0.0 |
| | | | 0 | 8.0 | 7.20 | 1 | 1 | 0 | 0 | 11 | 3 | 1 | 1 | 7 | 1 | 4 | 3 | 0 | 8 | 8 | 0 | 1.86 | 10.35 | 5.0 |
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| M. Leiter | RP | ATH | 12/11/2025 | Agrees to terms with Athletics. |
| M. Leiter | RP | ATH | 11/21/2025 | Dumped by Yankees. |
| M. Leiter | RP | ATH | 8/5/2025 | Reinstated from IL. |
| M. Leiter | RP | ATH | 7/8/2025 | Placed on 15-day injured list. |
| M. Leiter | RP | ATH | 2/1/2025 | Loses arbitration hearing. |
| M. Leiter | RP | ATH | 10/18/2024 | Added to ALCS roster. |
| M. Leiter | RP | ATH | 9/29/2024 | Reinstated from paternity list. |
| M. Leiter | RP | ATH | 9/26/2024 | Goes on paternity list. |
| M. Leiter | RP | ATH | 7/30/2024 | Shipped to Bronx. |
| M. Leiter | RP | ATH | 7/9/2024 | Activated from IL. |
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| M. Leiter | RP | ATH | 6/23/2025 | 7/7/2025 | -1 | Hits allowed |
| M. Leiter | RP | ATH | 6/23/2025 | 7/7/2025 | -1 | Earned runs allowed |
Stars of the month
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| March 27, 2025 | M. Leiter | ATH | RP | NA |
| March 30, 2025 | M. Leiter | ATH | RP | NA |
| April 01, 2025 | M. Leiter | ATH | RP | NA |
| April 03, 2025 | M. Leiter | ATH | RP | NA |
| April 05, 2025 | M. Leiter | ATH | RP | Rookie star |
| April 09, 2025 | M. Leiter | ATH | RP | 2nd star |
| April 12, 2025 | M. Leiter | ATH | RP | NA |
| April 13, 2025 | M. Leiter | ATH | RP | NA |
| April 16, 2025 | M. Leiter | ATH | RP | NA |
| April 18, 2025 | M. Leiter | ATH | RP | NA |
| April 19, 2025 | M. Leiter | ATH | RP | NA |
| April 22, 2025 | M. Leiter | ATH | RP | NA |
| April 25, 2025 | M. Leiter | ATH | RP | NA |
| April 27, 2025 | M. Leiter | ATH | RP | NA |
| April 30, 2025 | M. Leiter | ATH | RP | NA |
| May 03, 2025 | M. Leiter | ATH | RP | NA |
| May 09, 2025 | M. Leiter | ATH | RP | NA |
| May 12, 2025 | M. Leiter | ATH | RP | NA |
| May 13, 2025 | M. Leiter | ATH | RP | NA |
| May 16, 2025 | M. Leiter | ATH | RP | NA |
| May 17, 2025 | M. Leiter | ATH | RP | NA |
| May 20, 2025 | M. Leiter | ATH | RP | NA |
| May 22, 2025 | M. Leiter | ATH | RP | NA |
| May 25, 2025 | M. Leiter | ATH | RP | NA |
| May 26, 2025 | M. Leiter | ATH | RP | NA |
| May 28, 2025 | M. Leiter | ATH | RP | NA |
| May 31, 2025 | M. Leiter | ATH | RP | NA |
| June 03, 2025 | M. Leiter | ATH | RP | NA |
| June 05, 2025 | M. Leiter | ATH | RP | NA |
| June 07, 2025 | M. Leiter | ATH | RP | NA |
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Stars of the week
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| April 01, 2025 | M. Leiter | ATH | RP | 3rd star |
| April 22, 2025 | M. Leiter | ATH | RP | 1st star |
| May 03, 2025 | M. Leiter | ATH | RP | 2nd star |
| May 25, 2025 | M. Leiter | ATH | RP | 3rd star |
| May 31, 2025 | M. Leiter | ATH | RP | NA |
| June 11, 2025 | M. Leiter | ATH | RP | 2nd star |
| June 24, 2025 | M. Leiter | ATH | RP | 1st star |
| June 30, 2025 | M. Leiter | ATH | RP | 2nd star |
| July 01, 2025 | M. Leiter | ATH | RP | 2nd star |
| August 16, 2025 | M. Leiter | ATH | RP | 1st star |
| August 22, 2025 | M. Leiter | ATH | RP | 1st star |
| August 25, 2025 | M. Leiter | ATH | RP | 1st star |
| September 05, 2025 | M. Leiter | ATH | RP | 1st star |
| September 09, 2025 | M. Leiter | ATH | RP | Rookie star |
| September 10, 2025 | M. Leiter | ATH | RP | 1st star |
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