Colorado Rockies and Minnesota Twins each posted a 4.4 run value from successful challenge calls on May 19, 2026, according to a new report on the ABS challenge system. The Rockies’ performance puts them at the pinnacle of a metric that measures how much a team gains in runs by overturning umpire decisions.
Analysts say the advantage translates to roughly half a win per 162‑game schedule, a margin that can separate playoff contenders from the rest of the National League West. The Rockies, long‑known for a porous defense, are now leveraging data‑driven challenges to offset on‑field shortcomings.
How the ABS Challenge System Works
The ABS (Automated Ball‑Strike) challenge system allows managers to contest balls, strikes, and safe/out calls after a review request. Each successful overturn adds a positive run value, while failed attempts subtract points. Teams receive a limited number of challenges per game, making efficiency crucial.
What the Numbers Reveal About Colorado Rockies
Breaking down the report, the Rockies sit alone above a 4.0 run value, tied only with the Twins. Their success rate exceeds the league average, and the team has capitalized on high‑leverage situations, turning close calls into extra bases and runs. By contrast, the New York Yankees sit third with a 3.8 run value, while the Chicago White Sox and Atlanta Braves trail at 2.9. The data suggests the Rockies are not merely lucky; they are applying a disciplined, analytics‑first approach to challenges.
Key Developments
- The New York Yankees recorded a 3.8 run value, the highest among teams not tied for first.
- The Boston Red Sox generated only 0.12 runs per successful challenge despite having the fewest total challenges at 63.
- Texas Rangers posted the league’s best overall hitter success rate at 63 percent, overturning 29 of 43 challenges.
- Colorado Rockies executed 28 challenges in the first two months, winning 22, yielding a 78.6% success rate.
- The Twins matched the Rockies’ 4.4 run value but used three fewer challenges, highlighting efficiency differences.
What This Means for the Rest of MLB
Teams are likely to re‑evaluate their challenge strategies, emphasizing high‑leverage moments and better communication between coaching staff and replay officials. Front‑office brass may allocate more resources to staff who can interpret instant‑replay data in real time, a shift that could narrow the gap between high‑budget clubs and smaller markets. However, critics caution that over‑reliance on challenges could backfire if leagues tighten the limit on review attempts next season.
How does the ABS challenge system calculate run value?
Run value measures the estimated number of runs a team gains or loses from each successful or failed challenge, using historical win‑expectancy models. A 4.4 run value means the Rockies have effectively added that many runs to their total over the sample period.
Which team has the highest success rate for overturning hitter calls?
The Texas Rangers lead with a 63 percent success rate, overturning 29 of 43 challenges, indicating a strong ability to identify missed calls on the bases.
Why did the Boston Red Sox generate so few runs per challenge?
Boston’s 0.12 runs per challenge stem from a low volume of attempts—only 63 total—making each overturn less impactful on their overall run total.