He will miss the entire 2013 season following Tommy John surgery.

Tommy John surgery kept him out for the end of the year and the first half of the 2005 season.

The injury led to him having Tommy John surgery and missing the entire 2001 season.

He missed the entire 2011 season recovering from Tommy John surgery.

Following his first full season in 2008, he underwent Tommy John surgery.

He missed the first four months of the 2006 season, recovering from his Tommy John surgery.

In the summer of 2007, he had Tommy John surgery.

He also missed the entire 2012 season after undergoing Tommy John surgery.

He had Tommy John surgery after the season and missed all of 2007.

Chen had Tommy John surgery at the end of 2006 season.