SAN FRANCISCO -- A's shortstop Cliff Pennington left Monday night's contest against the Giants with a strained groin in the second inning. He was replaced by Eric Sogard, who delivered a two-run homer in the third inning.

Oakland manager Bob Melvin said Pennington tweaked his groin during warmups and that he may hold him out of Tuesday's exhibition game against the Giants in Oakland. Melvin wants to see how Pennington feels before speculating on his availability for Friday's home opener against the Seattle Mariners.

"I just know that I wanted to be as careful as I can be, and that's why he came out so early," Melvin said.