Latest from the Blog
Measuring ABS Decision Quality
Evaluating each pitch based on its likelihood to be challenged gives us insight into who is tapping at the right time
Nate Burke · Apr 4, 2026
Leaderboard
53.4%1030/1928 W
Role
Sort
| # | Player | Team | W/C | Win% | Net RE | Net WPA |
|---|---|---|---|---|---|---|
| 4 |  Logan O'Hoppe | LAA | 18/29 | 62% | +3.90 | +0.473 |
| 5 |  Cal Raleigh | SEA | 15/27 | 56% | +3.69 | +0.294 |
| 6 |  Salvador Perez | KC | 19/26 | 73% | +3.69 | +0.357 |
| 7 |  Ryan Jeffers | MIN | 20/32 | 63% | +3.66 | +0.334 |
| 8 |  Iván Herrera | STL | 16/22 | 73% | +3.63 | +0.387 |
| 9 |  Will Smith | LAD | 21/31 | 68% | +3.30 | +0.373 |
| 10 |  Brett Sullivan | COL | 14/23 | 61% | +3.22 | +0.313 |
League Challenge Trends
Average Challenge Inning
7 day rolling avg of each team's first challenge per game
Average:Challenge:Team:Outcome:
League
Recent Activity
Notable events from the last 7 days
- Ump Miss
David Rackley called a strike on a pitch 4.1 inches outside the zone against batter Justin Crawford in the bottom of the 4th4/30
- Ump Miss
Roberto Ortiz called a ball on a pitch 6.3 inches inside the zone against pitcher Bryce Elder in the top of the 2nd4/30
- Missed Opp
- Ump Miss
Mark Ripperger called a ball on a pitch 4.6 inches inside the zone against pitcher Matt Waldron in the top of the 2nd4/29
- Big Overturn
Sebastián Rivero overturned a ball to a strike in the bottom of the 7th against CWS for 1.72 Runs and 2.3% Win Probability4/28
- 1.5+ Runs
- Missed Opp
Ryan Jeffers missed a chance to overturn a ball to a strike in the top of the 5th against SEA for 0.96 Runs and 2.4% Win Probability4/27
- 10+ Win%
CLE gained 16.5% Win Probability from challenges in their game against TB4/27
- Ump Miss
John Bacon called a strike on a pitch 5.9 inches outside the zone against batter Rob Refsnyder in the top of the 9th4/26
- Big Overturn
Iván Herrera overturned a ball to a strike in the top of the 8th against SEA for 0.62 Runs and 11.5% Win Probability4/26
- Big Overturn
Brett Sullivan overturned a ball to a strike in the bottom of the 1st against NYM for 1.79 Runs and 17.1% Win Probability4/26
- 1.5+ Runs
- 10+ Win%
- 10+ Win%
- 6+ Challenges
WSH attempted 7 challenges in their game against CWS4/25
- Missed Opp
Adrian Del Castillo missed a chance to overturn a strike to a ball in the bottom of the 7th against SD for 0.35 Runs and 7.6% Win Probability4/25