Brewers right-hander Zack Greinke threw three scoreless innings for Class A Brevard County on Tuesday.
He is rehabbing after fracturing a rib this spring.
Greinke, 27, allowed one hit, struck out four and did not allow a walk to the Tampa Yankees in the Florida State League game.
He is expected to make one or two more rehab starts before returning to Milwaukee.
Greinke Throws Three Scoreless Innings