LaMarcus Aldridge had 26 points, including the go-ahead basket in the waning moments of overtime, and the Trail Blazers emerged with a 119-117 victory over the Warriors on Sunday night.
The win, which featured 16 lead changes and nine ties, assured the Blazers of no less than the fifth seed in the playoffs.
It also assured a postseason matchup against Houston, sitting in fourth in the Western Conference. With a win in one of their two remaining games, the Rockets can clinch home-court advantage.
Portland's win came despite the best efforts of Golden State's Stephen Curry, who had a season-high 47 points.