Andrus was signed in 2005 at age 16 to a six-figure contract. He started the year with the Orlando Braves of the Gulf Coast League, and was promoted to Danville late in the season. He spent 2006 with Class-A Rome, being named to the South Atlantic League All-Star team.
On July 31, 2007, Andrus, along with Jarrod Saltalamacchia and three other minor league pitchers (Matt Harrison, Neftali Feliz and Beau Jones), were traded from the Braves to the Rangers for Mark Teixeira and Ron Mahay.
With Rangers shortstop Michael Young agreeing to move to third base in 2009, Andrus earned the starting job on opening day. As Andrus was only 20 years old, Texas signed veteran shortstop Omar Vizquel for insurance. Andrus stole his 20th base on July 28, 2009 in his rookie season. Andrus is the 10th player in major league history to steal 20 bases under the age of 21. The last player to do that was then-teammate Andruw Jones in 1997 with the Atlanta Braves. Andrus was named to the 2010 American League All-Star team as a reserve shortstop.
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