Age: 30, 185 lbs, 5'10" Born: 10/31/1995, San Ramon, CA, USA Sal: N/A TRANSACTION REPORT 2 monthsRecalled, starting in finale. The Mariners recalled Mastrobuoni from Triple-A Tacoma on Sunday. He'll start at first base and bat ninth in the team's regular-season finale versus the Dodgers.
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| 2025 | SEA | 76 | 152 | 29 | 20 | 38 | 4 | 0 | 1 | 45 | 12 | 6 | 3 | 17 | 0 | 2 | 0 | 5 | 1 | 1 | 0.250 | 0.324 | 0.296 | 0.620 | 45.0 | 0.6 |
| 2024 | SEA | 50 | 98 | 17 | 9 | 19 | 3 | 0 | 0 | 22 | 4 | 2 | 0 | 7 | 0 | 1 | 0 | 0 | 1 | 3 | 0.194 | 0.245 | 0.224 | 0.470 | 22.0 | 0.4 |
| 2023 | CHC | 61 | 133 | 32 | 24 | 32 | 5 | 0 | 1 | 40 | 5 | 13 | 1 | 13 | 0 | 1 | 0 | 3 | 0 | 3 | 0.241 | 0.308 | 0.301 | 0.609 | 40.0 | 0.7 |
| 2022 | CHC | 8 | 16 | 6 | 1 | 3 | 0 | 0 | 0 | 3 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0.188 | 0.235 | 0.188 | 0.423 | 3.0 | 0.4 |
| | | 195 | 399 | 84 | 54 | 92 | 12 | 0 | 2 | 110 | 21 | 22 | 4 | 38 | 0 | 4 | 0 | 8 | 2 | 7 | 0.218 | 0.278 | 0.252 | 0.530 | 110.0 | 0.5 |
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| 10/13/2025 | TOR@ | W10 - 3 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 9/28/2025 | LAD | L1 - 6 | 3 | 1 | 0 | 1 | 1 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.333 | 0.333 | 2.000 | 2.333 | 2.0 |
| 8/7/2025 | CWS | W4 - 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0.000 | - | - | - | 0.0 |
| 8/5/2025 | CWS | W8 - 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 8/2/2025 | TEX | L4 - 6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 8/1/2025 | TEX | W4 - 3 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | - | - | - | 0.0 |
| 7/23/2025 | MIL | L2 - 10 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 7/20/2025 | HOU | L3 - 11 | 3 | 0 | 1 | 2 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0.667 | 0.750 | 2.000 | 2.750 | 2.0 |
| 7/19/2025 | HOU | W7 - 6 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 7/11/2025 | DET@ | W12 - 3 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.000 | 1.000 | 1.000 | 2.000 | 1.0 |
| | | | 12 | 3 | 3 | 4 | 1 | 0 | 0 | 5 | 0 | 2 | 0 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0.200 | 0.208 | 0.500 | 0.708 | 5.0 |
Stars of the month
Stars of the week
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| April 01, 2025 | M. Mastro | SEA | 3B | NA |
| April 06, 2025 | M. Mastro | SEA | 3B | NA |
| April 07, 2025 | M. Mastro | SEA | 3B | 3rd star |
| April 09, 2025 | M. Mastro | SEA | 3B | NA |
| April 11, 2025 | M. Mastro | SEA | 3B | NA |
| April 12, 2025 | M. Mastro | SEA | 3B | NA |
| April 13, 2025 | M. Mastro | SEA | 3B | NA |
| April 17, 2025 | M. Mastro | SEA | 3B | NA |
| April 18, 2025 | M. Mastro | SEA | 3B | 2nd star |
| April 19, 2025 | M. Mastro | SEA | 3B | 2nd star |
| April 22, 2025 | M. Mastro | SEA | 3B | NA |
| April 25, 2025 | M. Mastro | SEA | 3B | 2nd star |
| April 26, 2025 | M. Mastro | SEA | 3B | NA |
| April 27, 2025 | M. Mastro | SEA | 3B | NA |
| April 29, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 02, 2025 | M. Mastro | SEA | 3B | NA |
| May 04, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 05, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 06, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 10, 2025 | M. Mastro | SEA | 3B | NA |
| May 11, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 13, 2025 | M. Mastro | SEA | 3B | 3rd star |
| May 14, 2025 | M. Mastro | SEA | 3B | NA |
| May 16, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 17, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 18, 2025 | M. Mastro | SEA | 3B | NA |
| May 22, 2025 | M. Mastro | SEA | 3B | 2nd star |
| May 23, 2025 | M. Mastro | SEA | 3B | NA |
| May 28, 2025 | M. Mastro | SEA | 3B | NA |
| May 29, 2025 | M. Mastro | SEA | 3B | 3rd star |
| May 30, 2025 | M. Mastro | SEA | 3B | NA |
| June 05, 2025 | M. Mastro | SEA | 3B | 2nd star |
| June 07, 2025 | M. Mastro | SEA | 3B | 2nd star |
| June 09, 2025 | M. Mastro | SEA | 3B | 2nd star |
| June 15, 2025 | M. Mastro | SEA | 3B | NA |
| June 18, 2025 | M. Mastro | SEA | 3B | 2nd star |
| June 22, 2025 | M. Mastro | SEA | 3B | NA |
| June 25, 2025 | M. Mastro | SEA | 3B | NA |
| June 28, 2025 | M. Mastro | SEA | 3B | 2nd star |
| June 30, 2025 | M. Mastro | SEA | 3B | NA |
| July 06, 2025 | M. Mastro | SEA | 3B | 2nd star |
| July 10, 2025 | M. Mastro | SEA | 3B | 2nd star |
| July 20, 2025 | M. Mastro | SEA | 3B | NA |
| September 28, 2025 | M. Mastro | SEA | 3B | 2nd star |
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