LaMarcus Aldridge had 25 points and 14 rebounds and the Blazers rallied from a 13-point second-half deficit to beat the Thunder 98-94 in a showdown of Western Conference heavyweights.
Damian Lillard added 21 points and 11 assists and hit a pair of clinching free throws with 2.1 seconds left for Portland, which beat Oklahoma City for the second time in December.
Kevin Durant had 37 points and 14 rebounds for the Thunder, who had won 12 of their last 13 and 20 of the last 22 games before Tuesday.