Gagne will undergo season-ending surgery on Saturday to repair a herniated disc in his lower back. The closer woke up with back pain on Tuesday, but an epidural injection along with a nerve block didn't ease the pain. The Dodgers announced the bad news before Friday's game with the San Francisco Giants. (Updated 7/8/2006) Analysis: The 2003 NL Cy Young Award winner, Gagne was the majors' dominant closer from 2002-04, but has made only 16 appearances since the start of last season because of elbow problems. He had surgery on April 7 to remove a nerve in his pitching elbow and made his season debut on June 2. He didn't allow a hit or run in two innings pitched this season.