Loading players...
Jonathan Heasley played 4 major-league seasons (2021-2024) as a P (40). Career totals and every year-by-year line below come from the SABR/Lahman database (CC BY-SA), covering 1871-2025.
Showing 4 season lines
| Year | Age | Team | G | GS | W | L | SV | IP | SO | BB | ERA | ERA+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | 24 | KCA | 3 | 3 | 1 | 1 | 0 | 14.2 | 6 | 3 | 4.91 | 88 |
| 2022 | 25 | KCA | 21 | 21 | 4 | 10 | 0 | 104 | 70 | 47 | 5.28 | 73 |
| 2023 | 26 | KCA | 12 | 0 | 0 | 0 | 0 | 15 | 9 | 2 | 7.20 | 59 |
| 2024 | 27 | BAL | 4 | 0 | 0 | 1 | 0 | 5.1 | 4 | 3 | 16.88 | 24 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 2021 | P | 3 | 3 | 0 | 1 | 0 | 0 |
| 2022 | P | 21 | 21 | 4 | 5 | 1 | 1 |
| 2023 | P | 12 | 0 | 4 | 1 | 0 | 0 |
| 2024 | P | 4 | 0 | 1 | 1 | 0 | 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.
Jonathan Heasley is a playable Legends Deck card, rated from real Statcast data and refreshed nightly: view the Jonathan Heasley card.
| Date | Type | From | To | Details |
|---|---|---|---|---|
| Apr 11, 2026 | Signed as free agent | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Jonathan Heasley to a minor league contract. |
| Aug 5, 2025 | Signed as free agent | — | Kansas City Royals | Kansas City Royals signed free agent RHP Jonathan Heasley to a minor league contract. |
| Jan 24, 2025 | Signed as free agent | — | Chicago White Sox | Chicago White Sox signed free agent RHP Jonathan Heasley to a minor league contract and invited him to spring training. |
| Jul 25, 2024 | Released | — | Baltimore Orioles | Baltimore Orioles released RHP Jonathan Heasley. |
| Jun 18, 2018 | Signed | — | Kansas City Royals | Kansas City Royals signed RHP Jon Heasley. |
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.