David John "DJ" LeMahieu /lə.ˈmeɪ.hjuː/ (born July 13, 1988) is an American professional baseball second baseman for the Colorado Rockies of Major League Baseball. He was the second round draft pick of the Chicago Cubs in the 2009 MLB draft. LeMahieu has also filled in at third base for the Rockies.

LeMahieu played shortstop/pitcher for the Brother Rice High School Warriors in Bloomfield Township, Oakland County, Michigan. In his senior year, as a leadoff hitter he hit .574 with eight home runs, 16 doubles, seven triples, 70 runs, 32 RBI and 39 stolen bases. In 92 at-bats as a senior, LeMahieu struck out twice. His career average in high school was .459 with 201 hits. As a junior, he was an Aflac All-American. He was also a two-time Gatorade player of the year and Louisville Slugger Player of the Year for the State of Michigan. After his senior year at Rice, he was selected by the Detroit Tigers in the 2007 MLB draft in the 41st round.

LeMahieu helped lead LSU to the 2009 National Championship. LeMahieu was selected to the 2009 College World Series All-Tournament team. He hit .444 in the series leading all players in the series with 12 hits. LeMahieu's biggest hit was a 2 run double with two outs in the 9th inning of the first game in the championship series against Texas. LeMahieu then walked in the 11th and scored the go-ahead run.

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