The Astros' top four Minor League clubs were 235-187 entering play Sunday. They were a combined 202-329 overall last year.
After going 3-1 with a 5.57 ERA in four starts in Double-A, right-hander Bobby Doran was sent back to Class A Lancaster to make room for three starters the Astros received in July trades -- Rob Rasmussen, Matthew Heidenreich and Asher Wojciechowski.
Center fielder Austin Wates has been placed on the disabled list at Double-A Corpus Christi with a strained groin and has been replaced by Robbie Grossman, who's expected to start in center the rest of the season. Grossman was acquired from the Pirates in the Wandy Rodriguez trade.