Achilles tendon rupture
On October 24, 2016, Christmas signed with the Philadelphia 76ers, but was waived the same day. Five days later, he was acquired by the Delaware 87ers of the NBA Development League as an affiliate of the 76ers. On February 7, 2017, Christmas suffered a right Achilles tendon rupture and was subsequently ruled out for the season. He was waived later that day. In 31 games with the Sevens, he averaged 14.9 points, 3.5 rebounds and 3.2 assists in 31.6 minutes.