San Antonio came from behind to secure victory and move closer to NBA Finals, thanks to Manu Ginobili.
NBA: San Antonio Spurs claim late win over Oklahoma
The result stretches their winning streak to 19 games and moves the Texas side one game closer to securing a slot in the NBA Finals.
The Spurs, who trailed by nine points late in the third, turned the tables in the fourth, when they outscored Oklahoma City 39-27.
The Spurs also had just three turnovers in the second half, compared to their 13 in the first half.
Kevin Durant led Oklahoma City with 27 points and Russell Westbrook added 17, but they couldn't stop the Spurs in the final period.
Point guard Tony Parker scored 18 points with six assists for San Antonio, while Tim Duncan scored 16 and grabbed 11 rebounds.
With Argentinian Ginobili leading the way, the Spurs bench contributed 52 points.
The winner of this best-of-seven series will face either the Miami Heat or Boston Celtics for the NBA title. San Antonio host game two on Tuesday.
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