Christian Petersen/Getty ImagesCarlos Monasterios and Jon Link get some work in before Friday's game.His left knee is aching. If he were an old man, we'd just assume rain was coming, but he's a ballplayer, so instead James Loney will have an MRI performed, reports Tony Jackson of ESPNLosAngeles.com:... manager Don Mattingly said he wasn't overly concerned.Mattingly said Loney first began to feel it during stretching exercises before Thursday night's game against the Cincinnati Reds, then felt it again after playing four innings on Friday night against the San Francisco Giants."He feels it when he gets to a certain point in his stretching," Mattingly said. "It seems like it [isn't serious], because he isn't feeling any pain, and he played last night. But these gu