Clayton Kershaw only starts about 20 percent of the Dodgers' games, so you hate to see them spoiled.But on a night that Kershaw pitched his fourth complete game of the season and Matt Kemp had a double and triple in a 6-2 victory over San Diego, the Dodgers took what I would consider to be their worst blow of the season, non-ownership division, as well as their first big blow of 2012.Rubby De La Rosa, the prized rookie who figured to be a significant cog of the 2012 Dodger starting rotation, has a sprained ligament in his right elbow and will miss considerable time, with surgery a distinct possibility. Here's Tony Jackson of ESPNLosAngeles.com:... De La Rosa faces the possibility of season-ending elbow surgery after an MRI exam on Monday revealed a sprained ulnar-collateral ligamen