Chad Qualls hurled a scoreless ninth inning Monday to notch his eighth save of the season in a 4-3 victory against the Diamondbacks. Qualls gave up a double to Ender Inciarte that was misplayed by Marwin Gonzalez, playing left field as a chain reaction to Bo Porter's decision to make a double switch that had reliever Tony Sipp in right field for one play in the eighth. Qualls has five saves since May 29 and he hasn't given up a run since way back on April 19. On that day, through six appearances, Qualls held a 9.00 ERA. It's down to 2.08. As a suddenly effective closer on a suddenly scorching team (Houston has won 12 of 16 games), the case could be made that Qualls is one of the more underrated fantasy assets in the game at the moment.