Salvador Perez and the Kansas City Royals have been baseball’s best at utilizing their robot challenges through the first weekend of the Automated Ball-Strike System.

Perez topped all catchers by going 4-0 on challenges, while San Francisco’s Heliot Ramos and Cincinnati’s Eugenio Suárez were the only batters who went 2-0 — Suárez won his appeals on consecutive pitches. Three-time MVP Mike Trout of the Los Angeles Angels is 3-1 on challenges.

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