Mitchell learned of his promotion while sitting in the stands, charting pitches in last night's game at Rochester, N.Y. Warren's debut was likely already over at that point; he allowed six runs in the Yankees' 14-7 loss to the White Sox.
"We're in a tough spot with the injuries that we've had and the way we've had to use our pitching, and not getting any distance last night; that's just the way it works," said manager Joe Girardi. "As we told [Warren], 'Go continue to improve your stuff. You got that first one out of your way.' A lot of times with that first start, it's a mixed bag. Sometimes you'll get really good; sometimes it can be really difficult. There's not necessarily a determination from your first start how your career is going to go."
Mitchell's big league debut is already out of the way. He appeared twice in a six-day stint with the Yankees in late April and early May, throwing 2 2/3 innings out of the bullpen and allowing one run on four hits.
Mitchell started at Triple-A Scranton/Wilkes-Barre, where he's had an up-and-down season, posting a 5.36 ERA, but he threw seven innings of one-run ball on Tuesday. The right-hander returns to the bullpen, where he spent all of Spring Training in big league camp, as a long reliever for the Yankees.
"Early in the year, I started off really well," Mitchell said. "I kind of hit a bump in the road earlier this month and in late May, but the last start, I kind of figured some things out and started to get back on track, so hopefully I can carry it over to here."