Kevin Durant scored 28 points with seven rebounds to help Oklahoma City cool off the red-hot Spurs with a 106-94 decision and sweep the four-game season series between the teams.
Durant has now scored 25-plus points in 39 consecutive games, which is one shy of the all-time record set by Michael Jordan.
San Antonio had its 19-game winning streak halted in the process and the Thunder pulled within three games of the Spurs for first-place in the West.
Oklahoma City has eight games left on its schedule while the Spurs have six remaining.
Russell Westbrook netted 27 points with six assists in Oklahoma City's third straight victory overall and sixth win in its last eight games. Serge Ibaka contributed an 11-point, 12-rebound double-double and Reggie Jackson added 14 points off the bench for the Thunder.
Patty Mills paced San Antonio with 21 points, while Tim Duncan recorded 17 points and eight rebounds. Kawhi Leonard also added 17 points in the setback.