Rosenberg, who was recalled on Sunday morning to be the Phillies' 26th man for Sunday's doubleheader, was optioned back to Triple-A Lehigh Valley after Sunday night's 7-3 loss to the Rays.
Rosenberg made an appearance in the second game and struggled, walking four batters and allowing two earned runs in 2/3 of an inning.
The Phillies were able to call Rosenberg up for the day due to a rule in Major League Baseball's most-recent Collective Bargaining Agreement that allows clubs to carry an extra player for doubleheaders that occur at least two days after the originally-scheduled game was postponed.
"Whatever happens, happens," Rosenberg said before the doubleheader. "It's just fun to be here -- even if it is just for the day."