Rooker went 2-for-4 with a walk and a three-run home run in Saturday's 6-2 win over the Orioles.
The 31-year-old slugger took Shane Baz deep in the third inning for his fifth long ball of the season and third in eight May contests. On the month, Rooker is batting .333 (11-for-33) with a double, four runs and 10 RBI in addition to the homers.