Dallas Mavericks' first-round draft pick Shane Larkin underwent surgery Tuesday to repair a fractured right ankle, the team announced in a news release. He's expected to be sidelined for about three months. Larkin sustained the injury July 12 in the last practice before the team flew to Las Vegas for summer league games. Dallas acquired the draft rights to Larkin, the18th overall pick in the 2013 NBA Draft, from Atlanta in a draft night deal that sent Jared Cunningham and the draft rights to the 16th overall pick Lucas Nogueira to the Hawks.