Marin Catholic pitcher Gunnar Sandberg who suffered a near-fatal head injury after being hit by a line drive March 11, 2010, threw out the ceremonial first pitch as he returned to the ball field today to take part in a benefit game, in support of the Gunnar Sandberg Fund, against Justin-Siena High School at AT&amp;amp;T Ballpark in San Francisco, Calif. on Thursday May 6, 2010. Gunnar Sandberg, 16, of Kentfield was released this week from a San Francisco rehabilitation hospital, almost two months after the accident that left him in a coma for three weeks. Photo: Michael Macor, The Chronicle