PHILADELPHIA -- Right-hander Sean O'Sullivan will be brought up from Triple-A to start the second game of Saturday's doubleheader against the Braves, the Phillies announced on Thursday.
O'Sullivan will be pitching on five days' rest. He's posted a 4.31 ERA over 10 starts with Lehigh Valley this season. O'Sullivan made three starts with the Padres last year. He signed a Minor League contract with the Phillies in December. In 37 career Major League starts from 2009-13, O'Sullivan is 9-15 with a 6.02 ERA.
"He's one of the more experienced guys down there," Phillies manager Ryne Sandberg said. "He's got some experience starting in the big leagues."
The Phillies will need to clear a spot on the 40-man roster for O'Sullivan in advance of Saturday's doubleheader, but they do not need to make a move with the 25-man roster. A rule in the Collective Bargaining Agreement allows clubs a 26-man roster for day-night doubleheaders that are scheduled at least 48 hours in advance.
Right-hander Roberto Hernandez is scheduled to start the first game of the twin bill.
Austin Laymance is a reporter for MLB.com. Follow him on Twitter at @jalaymance. Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.