| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 11 | 8 | 0 | 0 | 146.0 | 132 | 31 | 114 | 61 | 3.76 | 1.121 | 38.8 |
| 2026 | 2 | 5 | 0 | 0 | 69.7 | 70 | 26 | 62 | 48 | 6.20 | 1.378 | -22.7 |
| 2025 | 11 | 7 | 0 | 0 | 129.7 | 110 | 27 | 98 | 53 | 3.68 | 1.057 | 46.4 |
| 2024 | 12 | 8 | 0 | 0 | 165.3 | 154 | 33 | 125 | 60 | 3.27 | 1.131 | 65.7 |
| Date | News |
| 7/28/26 | Cubs DFA veteran pitcher Taillon amid struggles. Jameson Taillon was designated for assignment by the Cubs on Monday, one day after giving up seven runs in four innings against the Pirates. Source: https://www.espn.com/mlb/story/_/id/49465134/cubs-... |
| 7/27/26 | Cubs DFA veteran pitcher Taillon amid struggles. Jameson Taillon was designated for assignment by the Cubs on Monday, one day after giving up seven runs in four innings against the Pirates. Source: https://www.espn.com/mlb/story/_/id/49465134/cubs-... |
| 6/10/26 | Cubs' Taillon out until after the All-Star break. The Chicago Cubs are expected to be without starter Jameson Taillon until after the All-Star break due to a strained left hamstring. Source: https://www.espn.com/mlb/story/_/id/49014382/cubs-... |
| 6/10/26 | Cubs' Taillon out until after the All-Star break. The Chicago Cubs are expected to be without starter Jameson Taillon until after the All-Star break due to a strained left hamstring. Source: https://www.espn.com/mlb/story/_/id/49014382/cubs-... |
| 6/10/26 | Cubs' Taillon out until after the All-Star break. The Chicago Cubs are expected to be without starter Jameson Taillon until after the All-Star break due to a strained left hamstring. Source: https://www.espn.com/mlb/story/_/id/49014382/cubs-... |
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