Gregerson struck out a batter during a perfect ninth inning Tuesday against the Rockies to earn his 17th save of the season. Gregerson needed only seven pitches (six thrown for strikes) to retire Charlie Blackmon, Corey Dickerson and Troy Tulowitzki in order. After a disastrous outing against Toronto on June 7, the 31-year-old right-hander has three straight scoreless appearances for the Astros, lowering his ERA from 4.50 to 4.00 during that span.