Ross said after the game he was "just a little sore," adding that he was taken out of the game for precautionary reasons and is having the MRI only to make sure "everything's intact and nothing crazy's going on." Ross wasn't sure whether he would be able to play Tuesday.
He came up limping in the top of the sixth after running down Kyle Phillips' flyout, saying he first felt the pain about halfway to the ball.
"Initially I thought it was not good, but I was able to jog and finish the inning and jog off the field," Ross said. "Those are positive signs. If it's something serious, I probably wouldn't even be able to walk, so I'm optimistic."
He told Giants manager Bruce Bochy he felt good enough to hit, but he would have to take it easy running to first base. Fortunately, Ross was able to take his time after drawing a walk. Right-hander Ryan Vogelsong then entered the game to pinch-run for Ross, while Andres Torres came in to play center field and Aaron Rowand moved from center to left.
Ross said the team doctor told him it was his hamstring, though he said the pain was more specifically in the back of his knee. They will continue to treat the injury with ice and anti-inflammatories, and Ross said he felt good enough to do everything but break into a full sprint.