Peralta struck out three batters and walked none. He entered the game with an 11.70 ERA after four Cactus League starts.
After Hosmer's homer snapped a scoreless tie, the Brewers answered with four runs in the fourth inning against Royals starter Dillon Gee. Jonathan Villar put Milwaukee on the board with an RBI single and scored on Maldonado's towering home run to left field.
Gee logged three hitless frames before laboring in the fourth.