According to the Associated Press, "Los Angeles Dodgers catcher Russell Martin has a mild sprain of his left knee and will be evaluated daily. He underwent a precautionary MRI exam on Wednesday and did not play in an 8-2 loss to the Chicago Cubs." Martin, who's leads all National League catchers in hits, runs scored, steals, walks, batting average and on-base percentage, is being listed as day-to-day.
Los Angeles Dodgers catcher Russell Martin is day-to-day because of a knee sprain - MLB - Yahoo! Sports