Robertson allowed a ninth-inning run in New York's 7-2 win over the Nationals on Friday, but he felt no stiffness in his left oblique, which provides the Yankees with an additional boost of relief.
"I gave up [a run], but in a situation where it really doesn't matter," Robertson said. "I still finished the ballgame; felt good. I'm ready for the next one. I came out of it in one piece."
Michael Morse slugged a leadoff double and scored on a groundout against Robertson, who hadn't pitched in a big league game since May 11 at Seattle. He made two Minor League rehab appearances for the nomadic Triple-A Scranton/Wilkes-Barre club.
"I'm very excited to be back here pitching in the big leagues," Robertson said. "It's a little better than Batavia, [N.Y.]."