Blair signed with the Mavs on Wednesday, the team announced. It's a one-year deal for the veteran's minimum of a little less than $1 million.
The 6-foot-7, 270-pound Blair will play primarily center for the Mavs, joining Samuel Dalembert, Brandan Wright and Bernard James in big-man committee. The Mavs believe Blair fills a need for a tough, rugged frontcourt player on the roster.
Blair played four seasons for the San Antonio Spurs after being selected with the 37th overall pick in the 2009 draft. He averaged 7.8 points and 5.8 rebounds in 18.9 minutes per game during his tenure with the Spurs.
The signing of Blair gives the Mavs a full roster of 15 players.