Hammons was selected in the second round, No. 46 overall, out of Purdue by Dallas in the 2016 draft. He appeared in 22 games last season with the Mavericks, averaging 2.2 points and 1.6 rebounds in an average of 7.4 minutes, shooting .405 percent from the field. He was named the 2016 Big Ten Defensive Player of the Year and was All-Big Ten first team as senior season at Purdue.