How MLB's and T-Mobile's ABS Challenge System Corrects Strike Calls in Seconds

MLB and T-Mobile’s ABS challenge system lets players review close strike calls in seconds using Hawk-Eye cameras and a private 5G network.

In a May 1 Mariners-Royals game, Leo Rivas challenged a strike call, and the stadium replay quickly confirmed the umpire’s ruling.

The system delivers near-instant strike-zone reviews across MLB parks, aiming to standardize calls and cut controversial errors.

Its low-latency setup combines cameras, private 5G, and stadium tech so fans, players, and officials see the same result almost immediately.