New York Yankees slugger Alex Rodriguez has been battling a left shoulder injury of unknown severity for the past couple of weeks, an injury that may be the reason for his lower-than-average power production. "It's just a small issue that only bothers him when he dives for a ball," manager Joe Girardi told ESPNNewYork.com after having a conversation with Rodriguez shortly before Sunday's game between the Yankees and Chicago Cubs at Wrigley Field. Read more: http://sports.espn.go.com/new-york/mlb/news/story?id=6678882