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Mason Barnett played 1 major-league season (2025) as a P (5). Career totals and every year-by-year line below come from the SABR/Lahman database (CC BY-SA), covering 1871-2025.
Showing 1 season lines
| Year | Age | Team | G | GS | W | L | SV | IP | SO | BB | ERA | ERA+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | 25 | ATH | 5 | 5 | 1 | 1 | 0 | 22.1 | 18 | 11 | 6.85 | 60 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 2025 | P | 5 | 5 | 2 | 4 | 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.
Mason Barnett is a playable Legends Deck card, rated from real Statcast data and refreshed nightly: view the Mason Barnett card.
Mason Barnett appears in 2 archived official MLB transactions (1 trade), newest first.
| Date | Type | From | To | Details |
|---|---|---|---|---|
| Jul 30, 2024 | Trade | Kansas City Royals | Athletics | Oakland Athletics traded RHP Lucas Erceg to Kansas City Royals for RHP Will Klein, RHP Mason Barnett and OF Jared Dickey. |
| Jul 24, 2022 | Signed | — | Kansas City Royals | Kansas City Royals signed RHP Mason Barnett. |
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.