John McMillon
Pitcher · Career Stats, Bio & Records (2023-2024)
John McMillon was a pitcher who played in Major League Baseball from 2023 to 2024 for the Kansas City Royals and the Miami Marlins, a span of 2 seasons. Across 14 career appearances, he went 2-1 with a 1.69 ERA and 21 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 224.0.
- W (Wins):
- Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
- ERA (Earned Run Average):
- Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
- SO (Strikeouts):
- For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
- WHIP (Walks and Hits per Inning Pitched):
- Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.
Data updated
- Position
- Pitcher
- Bats / Throws
- L / R
- Height / Weight
- 6'3" / 230 lb
- MLB Debut
- 2023-08-17
Full name: John Mitchell McMillon
Season-by-Season Pitching
Click a stat to plot it across every season.
| Year | Team | Lg | W | L | G | GS | CG | SHO | SV | IP | H | ER | BB | SO | ERA | Lg ERA | Pitcher PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | KCA | AL | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 4.0 | 1 | 1 | 0 | 8 | 2.25 | — | 0.0 |
| 2024 | MIA | NL | 2 | 1 | 10 | 0 | 0 | 0 | 0 | 12.0 | 7 | 2 | 5 | 13 | 1.50 | 4.08 (+63%) | 224.0 |
| Career · 2 seasons | 2 | 1 | 14 | 0 | 0 | 0 | 0 | 16.0 | 8 | 3 | 5 | 21 | 1.69 | — | 224 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Season-by-Season Batting
Click a stat to plot it across every season.
| Year | Team | Lg | G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | Lg AVG | Lg OBP | Lg SLG | Lg OPS | PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | KCA | AL | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2024 | MIA | NL | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| Career · 2 seasons | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | — | 0 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Game Log & Splits
View full game log (28 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 6 | 0 | 0 | 0 | 0 | 0 | — |
| Away | 8 | 0 | 0 | 0 | 0 | 0 | — |
Pitching — Home / Away
| Split | G | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Home | 6 | 7.2 | 6 | 3 | 4 | 10 | 3.52 |
| Away | 8 | 8.1 | 2 | 0 | 1 | 11 | 0.00 |
Last 10 Games — Pitching
| Date | Tm | Opp | Dec | IP | H | R | ER | BB | SO | HR |
|---|---|---|---|---|---|---|---|---|---|---|
| 2024-09-11 | MIA | PIT | — | 0.0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2024-09-07 | MIA | PHI | W | 1.1 | 2 | 0 | 0 | 0 | 1 | 0 |
| 2024-09-04 | MIA | WAS | W | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 |
| 2024-09-01 | MIA | SFG | — | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 |
| 2024-08-31 | MIA | SFG | — | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2024-08-26 | MIA | COL | — | 1.1 | 0 | 0 | 0 | 1 | 2 | 0 |
| 2024-08-24 | MIA | CHC | — | 1.1 | 2 | 1 | 0 | 1 | 3 | 0 |
| 2024-08-19 | MIA | AZ | — | 2.0 | 1 | 2 | 2 | 1 | 2 | 1 |
| 2024-08-16 | MIA | NYN | — | 2.0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 2024-08-10 | MIA | SDP | L | 1.0 | 0 | 1 | 0 | 2 | 0 | 0 |
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Pitcher | 14 |
John McMillon: the record in brief
John McMillon's entire major league record comes from the period beginning August 17, 2023. The team column moves through the Kansas City Royals (2023) and the Miami Marlins (2024). Born on January 27, 1998, in Lufkin, TX, USA, McMillon is listed as a pitcher and threw right-handed and batted left-handed. McMillon's listed size is 6 feet, 3 inches and 230 pounds. The bio lists the given name John Mitchell.
McMillon's career pitching line is 2 wins, 1 loss and a 1.69 ERA over 14 appearances. Also on McMillon's record: 21 strikeouts. The leagues McMillon pitched in allowed 4.21 earned runs per nine over those seasons, so the career ERA was 59.9% better than average. 2024 was McMillon's sharpest full season, a 1.50 ERA against the league's 4.08. By Pitcher PIV, Baseball Data Hub's measure of run prevention relative to each season's league, McMillon's career adds up to 224.0.
Every defensive appearance on record for McMillon, 14 games, came at pitcher. The fielding table credits McMillon with 1 putouts, 1 assists and 1 errors on the mound.
The game-log section draws on 28 games of Retrosheet box scores for McMillon.
Frequently Asked Questions about John McMillon
- What years did John McMillon play?
- John McMillon played in Major League Baseball from 2023 to 2024.
- Was John McMillon a pitcher?
- Yes. John McMillon pitched in the major leagues, recording 2 wins and 21 strikeouts.
- What teams did John McMillon play for?
- John McMillon played for 2 teams: the Kansas City Royals (2023) and the Miami Marlins (2024).
- What were John McMillon's career stats?
- In 14 games, John McMillon went 2-1 with a 1.69 ERA, 21 strikeouts, and 16.0 innings pitched.
- What position did John McMillon play?
- John McMillon played primarily as a pitcher, the position where he appeared in the most games.
- How tall was John McMillon and how much did he weigh?
- John McMillon was listed at 6 feet 3 inches and 230 pounds.
- What was John McMillon's career ERA?
- John McMillon finished with a 1.69 career ERA, going 2-1 with 21 strikeouts.
- How many strikeouts did John McMillon have?
- John McMillon recorded 21 career strikeouts.
- Is John McMillon in the Hall of Fame?
- No. John McMillon has not been inducted into the National Baseball Hall of Fame.