Ramon Hernandez ruptured his left distal hamstring tendon Monday and is done for the rest of the season. An MRI taken Wednesday revealed the injury. Hernandez is scheduled to undergo surgery next week and may struggle to get back to 100 percent health by the start of spring training next February. The 36-year-old is under contract with the Rockies in 2013 at a $3.2 million rate. He'll again be an expensive backup to Wilin Rosario.