"We're aware of it," Girardi said. "We understand the fastball velocity is not what it used to be, but my thought is, he can still really pitch at a high level. Will he give up more home runs this year than last year? Probably. It would be great if he didn't."
Sabathia allowed six runs on eight hits in six innings in a 6-4 loss in Oakland.
• On this date in 2008, Hideki Matsui became the first Yankee to hit a grand slam on his birthday, in a 4-1 win at Oakland.
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.