It looks like Toronto may have another sore elbow to deal with on its' already depleted pitching roster. While preliminary tests by team trainers found nothing out of the ordinary, pitcher Gustavo Chacin will undergo an MRI exam this morning to see why he had to call it a night after three full innings and 72 pitches. Chacin said he first felt a tightness in his left elbow while warming up. He suspected it would dissipate as he continued throwing into the game, but the barking never stopped. "I'm thinking if I keep throwing maybe it's gone," said Chacin, who has no history of elbow problems. "This time, it's not."