New U. of Michigan football coach Jim Harbaugh was in camp and in uniform with the A's on Saturday at the invitation of Oakland manager Bob Melvin.

Harbaugh was in full uniform instead of his trademark sideline khaki pants. He was wearing No. 4, his old number as a quarterback, while sporting a high-socks look.

"He requested those," Melvin said with a smile.

Melvin let Harbaugh coach first base against the Angels at HoHoKam Stadium.

Harbaugh came into the game in the third inning, and coached first base all the way to the A's win in the bottom of the ninth.