The Thunder erased a 13-point deficit to beat the Miami Heat 105-94 in Game One of the NBA Finals on Tuesday in Oklahoma City (Wednesday in Manila).
Kevin Durant scored 17 points in the fourth period, hitting six of 10 field goals.
The NBA scoring champion finished with 36 points, while Russell Westbrook added 27 points and 11 assists and Serge Ibaka added 10 points.
Three-time Most Valuable Player LeBron James scored 30 points, Dwyane Wade had 19 and Shane Battier came up with 17 for Miami.
Game Two is set Thursday night in Oklahoma City (Friday in Manila).