The Astros will go with a match-up based approach to their bullpen roles for now. Hader will undergo more testing on the sore shoulder.

Astros Get Concerning Josh Hader News After Red Sox Game originally appeared on Athlon Sports. The Houston Astros defeated the Boston Red Sox on Monday, 7-6, to stay on top of the American League West with the Seattle Mariners right on their tails.

Hader, 31, has pitched just three times in August, with his most recent appearance (on Aug. 8) doubling as his seventh this season in which he's logged four or more outs. He's been highly effective overall, tallying a 2.05 ERA (202 ERA+) and a 4.75 strikeout-to-walk ratio.