Astros were swept by the Chicago White Sox in four games, though Berkman compiled a .385 average with two doubles. His six RBIs during that series were the most of any of the Astros' hitters. On Mother's Day, May 14, 2006, Berkman was one of more than 50 hitters who brandished a pink bat to benefit the Breast Cancer Foundation. On September 13, 2006, Berkman became only the second switch hitter in Major League history to hit 40 or more homers in multiple seasons, with Mickey Mantle being the first. During the 2006 season, Berkman hit 45 home runs and had 136 RBI. He broke the Astros' single season record for RBI, previously set by Bagwell in 1997 with 135. He also had a .315 batting average, an on-base percentage of .420, as well as a slugging percentage of .621. He also hit a career high 5 home runs from the right side of the plate. He finished third in the MVP voting behind Ryan Howard and Albert Pujols. Berkman started the 2007 season in a bit of a slump, batting .261, well below his career average, but rebounded for a strong second half of the season. Berkman finished the 2007 season with a .278 batting average, 34 home runs and 102 RBIs, along with 7 stolen bases. Berkman started the 2008 season batting well above .385 through April, won the NL Player of the Month in May and two separate Player of the Week awards, one which he went 29–32 (batted .906) with 6 home runs, including a McCovey Cove splash landing. At the All-Star break, he was in the NL's top four in batting average, with 22 home runs, and was on pace for 130+ RBIs. However, despite the rest of the team picking up steam behind the likes of Roy Oswalt, Wandy Rodríguez, Hunter Pence, and Ty Wigginton's rebound second half, Berkman's individual performance dipped significantly, and by season's end, he batted .312, with 29 home runs (7 of which were right-handed, setting a new career high), 106 RBI, and an NL-leading 46 doubles. Berkman was fifth in the voting for the 2008 NL MVP award, behind Albert Pujols, Ryan Howard, Ryan Braun, and Manny Ramirez. Berkman hit his 300th home run against Arizona Diamondbacks starter Jon Garland on June 13, 2009. New York Yankees (2010) On July 31, 2010, Berkman was traded to the New York