In early testing, umpires wore ear buds and would hear “ball” or “strike,” then relay that to players and fans with traditional hand signals. The challenge system adds a wrinkle.

In early testing, umpires wore ear buds and would hear “ball” or “strike,” then relay that to players and fans with traditional hand signals.The challenge system adds a wrinkle.

In early testing, umpires wore ear buds and would hear “ball” or “strike,” then relay that to players and fans with traditional hand signals. Paige Bueckers is shooting 53.4 percent from the field, 40 ...

In early testing, umpires wore ear buds and would hear “ball” or “strike,” then relay that to players and fans with traditional hand signals. The challenge system adds a wrinkle. During spring ...