Spurs top Mavericks to close within top spot in West
Making his second start of the season and seventh of his career with Parker nursing a bad back, Mills had 11 points and a pair of steals in the third quarter when the Spurs turned a two-point deficit into an 11-point lead.
The Spurs beat the Mavericks for the ninth straight time in the regular season, a streak that has lasted more than two years.
Tim Duncan had 20 points and 15 rebounds after leaving briefly in the first quarter because of a hyperextended right knee. Kawhi Leonard added 16 points, a career-high 16 rebounds and five assists.
The Spurs are in the playoffs, and the defending conference champions are just a win or an Oklahoma City loss away from securing the top seed in the West.
The Spurs had a scary moment early when Duncan crumpled to the court holding his right knee and stayed down for a Dallas possession at the other end. When the Spurs got the game stopped with 5:58 left in the first quarter, he headed for a tunnel but emerged a few minutes later and returned to the game.