	On March 8, 2016, Williams signed a 10-day contract with the Phoenix Suns. He made his NBA debut on March 17 during a 103–69 loss to the Utah Jazz, recording one point and one steal in two minutes. The following day, he signed a multi-year deal with the Suns. On April 9, he recorded a then season-high seven rebounds in a 121–100 win over the New Orleans Pelicans. In the Suns' season finale on April 13, Williams recorded his first double-double in the NBA with season highs of 14 points and 12 rebounds (alongside 3 blocks) in a 114–105 win over the Los Angeles Clippers.