Gregerson struck out two during a perfect ninth inning Tuesday to earn his 13th save of the season. Gregerson rebounded nicely Tuesday after allowing a home run in his previous appearance Sunday at Detroit. He needed only 10 pitches to retire Chris Davis, Alejandro de Aza and Delmon Young in order. Through 21 relief appearances with the Astros this season, he has a 3.92 ERA, 1.06 WHIP and 20:5 K:BB over 20.2 innings.