In April 2015, Singh was announced as an early entrant for the 2015 NBA draft. At the draft on June 25, 2015, he was selected by the Dallas Mavericks with the 52nd overall pick, becoming the first Indian-born player to be drafted into the NBA. Singh also became the first player since the 2005 draft to enter without playing in college, overseas professionally, or in the NBA Development League. On July 8, 2019, his draft rights were traded alongside two second round picks to the Memphis Grizzlies in a sign and trade for Delon Wright.