What happened: The switch followed a four-pitch walk and a near-hit by pitch. Milwaukee had hoped May would face right-handed-hitting Xander Bogaerts before turning to left-hander Romero.

Why it matters: The game has not started, with the score 0-0. The early call sets the left-right order for the bullpen from the outset.

What to watch: Romero's start against Bogaerts will show how that order holds.