Booser picked up a hold Friday against Arizona, recording the final out of the sixth inning.
After beginning the season with Triple-A Durham, Booser has since carved out a key spot in the Rays' bullpen. Through 9.1 innings thus far, the 34-year-old left-hander has a 0.96 ERA, 0.96 WHIP and 10:3 K:BB with two holds.