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Aaron Bummer played 9 major-league seasons (2017-2025) as a P (387). Career totals and every year-by-year line below come from the SABR/Lahman database (CC BY-SA), covering 1871-2025.
Showing 9 season lines
| Year | Age | Team | G | GS | W | L | SV | IP | SO | BB | ERA | ERA+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017 | 24 | CHA | 30 | 0 | 1 | 3 | 0 | 22 | 17 | 15 | 4.50 | 97 |
| 2018 | 25 | CHA | 37 | 0 | 0 | 1 | 0 | 31.2 | 35 | 10 | 4.26 | 100 |
| 2019 | 26 | CHA | 58 | 0 | 0 | 0 | 1 | 67.2 | 60 | 24 | 2.13 | 216 |
| 2020 | 27 | CHA | 9 | 0 | 1 | 0 | 0 | 9.1 | 14 | 5 | 0.96 | 459 |
| 2021 | 28 | CHA | 62 | 0 | 5 | 5 | 2 | 56.1 | 75 | 29 | 3.51 | 123 |
| 2022 | 29 | CHA | 32 | 0 | 2 | 1 | 2 | 26.2 | 30 | 10 | 2.36 | 164 |
| 2023 | 30 | CHA | 61 | 0 | 5 | 5 | 0 | 58.1 | 78 | 36 | 6.79 | 63 |
| 2024 | 31 | ATL | 56 | 0 | 4 | 3 | 0 | 55.1 | 69 | 18 | 3.58 | 116 |
| 2025 | 32 | ATL | 42 | 2 | 3 | 2 | 0 | 54.1 | 51 | 17 | 3.81 | 111 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 2017 | P | 30 | 0 | 1 | 6 | 1 | 1 |
| 2018 | P | 37 | 0 | 1 | 2 | 0 | 1 |
| 2019 | P | 58 | 0 | 4 | 12 | 1 | 1 |
| 2020 | P | 9 | 0 | 0 | 0 | 1 | 0 |
| 2021 | P | 62 | 0 | 2 | 9 | 1 | 2 |
| 2022 | P | 32 | 0 | 0 | 2 | 0 | 0 |
| 2023 | P | 61 | 0 | 7 | 7 | 1 | 0 |
| 2024 | P | 56 | 0 | 1 | 10 | 1 | 0 |
| 2025 | P | 42 | 2 | 3 | 8 | 2 | 0 |
Team codes are the source codes (e.g. NYN for the New York Mets, BS1 for the 1875 Boston club). OPS+ is league-season normalized, not park-adjusted; unrecorded source values (such as RBI in the earliest recorded seasons) are absent, never zero-filled.
Aaron Bummer is a playable Legends Deck card, rated from real Statcast data and refreshed nightly: view the Aaron Bummer card.
Aaron Bummer appears in 5 archived official MLB transactions (1 trade), newest first.
| Date | Type | From | To | Details |
|---|---|---|---|---|
| Jul 21, 2026 | Signed as free agent | — | Kansas City Royals | Kansas City Royals signed free agent LHP Aaron Bummer to a minor league contract. |
| Jun 1, 2026 | Signed as free agent | — | Chicago Cubs | Chicago Cubs signed free agent LHP Aaron Bummer to a minor league contract. |
| May 19, 2026 | Released | — | Atlanta Braves | Atlanta Braves released LHP Aaron Bummer. |
| Nov 16, 2023 | Trade | Chicago White Sox | Atlanta Braves | Chicago White Sox traded LHP Aaron Bummer to Atlanta Braves for RHP Michael Soroka, LHP Jared Shuster, SS Nicky Lopez, SS Braden Shewmake and RHP Riley Gowens. |
| Jun 10, 2014 | Signed | — | Chicago White Sox | Chicago White Sox signed LHP Aaron Bummer. |
From MLB’s official StatsAPI transactions feed (2011 to the current season, trades/signings/releases involving major-league clubs). Browse the full archive.
Every career total and season line is computed from the SABR / Sean Lahman baseball database (2025 edition, CC BY-SA 3.0), the same source behind our historical position leaderboards. Rate stats use league-season normalization only (OPS+ and ERA+ as marked, never park-adjusted); unrecorded early-era values stay absent rather than being invented. Career totals sum only what the source records.
Award winners and MVP / Cy Young / Rookie of the Year voting history come from the same database; the year pages live under MLB award voting history. Official transactions (2011 to the current season) come from the MLB StatsAPI feed on our transactions archive.