He was named CL Rookie of the Year in 2005 and was the CL stolen base leader in 2006. Aoki was also a two time NPB All-Star Game MVP in 2006 and 2009. Representing Japan he won Gold medals at the 2006 and 2009 World Baseball Classics and was named to the All-Tournament Team in 2009. In 2012 the Milwaukee Brewers signed Aoki to a two year contract. In December 2013 he was traded to the Kansas City Royals. He is one of just four players to have 200 or more hits in a single season in Japanese professional baseball. Aoki also competed for Japan in the 2008 Beijing Olympics.