Research
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How to read this page
A player page shows one box score, because a hitter and a pitcher share almost no column — which half you get follows the one he appears in. Every rate is built from summed counts, so a batting average is hits over at bats across whatever window you picked rather than an average of nightly averages. Pitchers rank against starters or relievers, which is the split the sport itself draws. A dash means no number for that cell, or a zero in a roster column that counts.
Jack Leiter
Pitcher2026 · Regular Season
Cardsall 4 shown▶
Playing TimeDefensevs Starting Pitchers▶
ResultsDefensevs Starting Pitchers▶
CommandDefensevs Starting Pitchers▶
StartingDefensevs Starting Pitchers▶
Game log15 games
| Date | Opp | IP | W | L | SV | H | HR | K | BB | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|
| June 18, 2026 |  MIN | 2 | 0 | 1 | 0 | 7 | 2 | 4 | 2 | 27.00 | 4.50 |
| June 12, 2026 | @ BOS | 5 | 0 | 1 | 0 | 8 | 1 | 3 | 2 | 9.00 | 2.00 |
| June 6, 2026 |  CLE | 4.2 | 0 | 1 | 0 | 6 | 2 | 2 | 3 | 9.64 | 1.93 |
| May 31, 2026 |  KC | 2 | 1 | 0 | 0 | 3 | 0 | 10 | 2 | 0.00 | 2.50 |
| May 26, 2026 |  HOU | 3.1 | 1 | 0 | 0 | 4 | 1 | 4 | 3 | 10.80 | 2.10 |
| May 20, 2026 | @ COL | 5 | 0 | 0 | 0 | 7 | 0 | 5 | 2 | 7.20 | 1.80 |
| May 15, 2026 | @HOU | 4 | 0 | 1 | 0 | 3 | 1 | 6 | 3 | 2.25 | 1.50 |
| May 9, 2026 |  CHC | 0.2 | 0 | 0 | 0 | 4 | 0 | 6 | 5 | 0.00 | 13.50 |
| May 3, 2026 | @ DET | 6.1 | 0 | 1 | 0 | 5 | 1 | 10 | 1 | 7.11 | 0.95 |
| April 27, 2026 |  NYY | 4 | 0 | 1 | 0 | 8 | 3 | 4 | 1 | 9.00 | 2.25 |
| April 22, 2026 |  PIT | 5 | 0 | 0 | 0 | 5 | 0 | 5 | 2 | 5.40 | 1.40 |
| April 16, 2026 | @ ATH | 5.2 | 0 | 0 | 0 | 7 | 0 | 3 | 3 | 4.76 | 1.76 |
| April 11, 2026 | @ LAD | 3.2 | 0 | 1 | 0 | 5 | 2 | 4 | 4 | 12.27 | 2.45 |
| April 5, 2026 |  CIN | 5 | 0 | 0 | 0 | 4 | 0 | 9 | 1 | 1.80 | 1.00 |
| March 30, 2026 | @ BAL | 6 | 1 | 0 | 0 | 5 | 1 | 8 | 1 | 3.00 | 1.00 |
| Season | G | GS | IP | W | L | SV | ERA | WHIP | H | HR | K | BB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 15 | 15 | 62.1 | 3 | 7 | 0 | 6.93 | 1.86 | 81 | 14 | 83 | 35 |
| 2025 | 29 | 29 | 151.2 | 10 | 10 | 0 | 3.86 | 1.28 | 127 | 18 | 148 | 67 |
| 2024 | 9 | 6 | 35.2 | 0 | 3 | 0 | 8.83 | 1.71 | 44 | 7 | 31 | 17 |
About MLB Research
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Every number the site holds for a Major League team and the players who played for it, in one place. Pick a club, a season and a set of games, and read it. Nothing here needs an account.
Where the numbers come from
The same tables the boards read, resolved through one shared definition per stat. A rate is computed over the whole window rather than averaged across games, so a season figure is not the mean of the nightly ones.