Rosenberg was 1-2 with a 6.12 ERA in 22 relief appearances for Philadelphia last season. He was 1-3 and had a 4.30 ERA in seven starts at Lehigh this season.
The Atlanta Braves beat the Philadelphia Phillies 9-2 on Wednesday night.
The Philadelphia Phillies have placed left-hander Raul Valdes on the 15-day disabled list because of a right hip strain.
Brian McCann homered for the third straight game in the series and Dan Uggla hit a two-run shot to lead the Atlanta Braves to a three-game sweep of the Philadelphia Phillies in a 4-3 win on Sunday.
Shane Victorino and Freddy Galvis each drove in three runs, including Galvis’ go-ahead single in the sixth inning, and the Philadelphia Philles beat the St. Louis Cardinals 10-9 on Thursday night.
The Phillies added three new players to the major league roster.