Mat Gamel is scheduled to undergo surgery on Friday in Scottsdale, Arizona to repair a new tear in his right ACL. Gamel has already been ruled out for all of 2013 and will probably be placed on the 60-day disabled list shortly. He also missed most of 2012. The 27-year-old will be arbitration-eligible next winter but has only appeared in 106 major league games over the past five seasons.