OAKLAND -- So much for rookie first baseman Tommy Everidge's mental day off.

Everidge was supposed to get Monday night off -- and possibly Tuesday -- to cool his competitive jets and work on some minor swing changes, but his replacement in the starting lineup, utilityman Bobby Crosby, exited Monday's game in the sixth inning with tightness in his left calf.

That forced Everidge into action, and with Crosby still hobbled Tuesday, Everidge was in the starting lineup -- at designated hitter -- for the second game of a three-game series against the visiting Yankees at the Oakland-Alameda County Coliseum.

"He's day-to-day," A's manager Bob Geren said of Crosby, "and today isn't his day."

Geren noted that Crosby wasn't completely unavailable, saying he'd be the "last in line" in term of players coming off the bench. The bench, though, is pretty short as it is. That's why Nomar Garciaparra started at first base in only his second defensive appearance since the All-Star break.

The A's optioned outfielder Aaron Cunningham to Triple-A Sacramento on Monday to make room for Brett Tomko, who was promoted to start that night and beat the Yankees with five shutout innings. Tomko earned himself another assignment, and the A's are sticking with an eight-man bullpen for the time being, so Geren is down to three reserve position players.

On Tuesday, they were backup catcher Landon Powell, outfielder/DH Jack Cust and Crosby.