ハワイ・ウィンターリーグ
In 2005, Mayberry was rated by "Baseball America" as the Best Athlete and Best Outfield Arm among all Texas Rangers minor leaguers. In 2006 he was rated by "Baseball America" as the Best Power Hitter, Best Athlete, and Best Outfield Arm among all Texas Rangers minor leaguers, and was named a Hawaii Winter Baseball league post-season All Star. In 2007, Mayberry hit 30 home runs (tied for 11th among all minor leaguers), was named a California League mid-season All Star, and was named an Arizona Fall League Rising Star. On November 20, 2008, the Philadelphia Phillies traded for him. With the Phillies, Mayberry started in Triple-A, and was called up to the major league team in May. He hit a home run in his major league debut, but was sent back to the minors a few weeks later, and spent the majority of the 2009 and 2010 seasons there. Mayberry was named an MiLB.com 2010 Phillies Organization All Star. He returned to the major league squad in 2010 as a September callup, and remained there, with the exception of a short stint in Triple-A in 2011. In 2011, Mayberry played over 100 games, splitting time between outfield and first base, as well as pinch hitting. Statistically, 2011 was his best major league season. He remained with the big-league club in 2012, and played predominantly in left field early in the season, and subsequently as the team's everyday center fielder. In 2012 and 2013 Mayberry‘s batting average declined.