Bachar will start Wednesday's game against the White Sox, Dominic Campbell of SI.com reports.
Pittsburgh is going to rely on its bullpen to get through Wednesday's contest, and Bachar will begin the game on the mound for what will be his ninth start of the season. The 31-year-old righty has tossed at least two innings in eight of his 11 appearances since the beginning of August, so he'll likely be called upon to provide more length than the typical opening pitcher.