Gregerson struck out one during a perfect ninth inning Thursday to earn his seventh save of the season. Gregerson, who retired Matt Joyce, David Freese and Erick Aybar in order for the easy save, has been a key factor in the Astros' turn-around this season. He's helped stabilize a much-improved bullpen, which collectively ranks fifth in MLB with a 2.12 ERA after ranking dead-last (4.80) in the category a year ago.