Leonard got huge help from veteran Manu Ginobili who also planted a risky but heroic block on Harden's attempt at the three-point line seconds before the 5-minute overtime ended.
The Rockets also had trouble scoring in general, making just 28.6 per cent (22 of 77) of their shots overall.
The San Antonio Spurs humiliated the Houston Rockets Thursday (Friday in Manila) with a 114-75 Game 6 closeout win that brought James Harden's MVP-worthy season to a startling halt. The Warriors host Game 1 and the action starts on Sunday, May 14, at 3:30 p.m. ET on ABC.
The Golden State Warriors have coasted their way into the Western Conference Finals without being truly tested. "As a team, as a unit, we didn't have a rhythm and they capitalized on that", added the 27-year-old shooting guard.
After the Spurs routed the Houston Rockets on Thursday night to advance, the Westgate opened San Antonio as a 900 underdog and Golden State as a massive -1600 favorite to win the series.
Only one series is left to be decided in the second round of the NBA Playoffs.
Game 6 highlighted something that has been clear for a while now: The Spurs are the great chameleon of pro sports and have shown themselves to be capable of navigating just about any scenario thrown their way.
San Antonio will now face No. 1 seed Golden State in the Western Conference Finals.
Leonard had an MRI on Monday and will not play in Game 2, leaving the Spurs angry at what they considered a dirty play by Pachulia and frustrated by their predicament. The Spurs are without French star guard Tony Parker, out for the remainder of the playoffs with a torn left quadriceps.
The 2017 NBA Playoffs continue as Game 1 of the Western Conference Finals between the Spurs and the Warriors is just around the corner.
The X-factor in the series is the health of the Spurs' best player, forward Kawhi Leonard, who sat out the final Rockets game with an injured ankle. Even in the loss, the Spurs only gave up a 110 points, but their offense isn't capable of consistently scoring at that output in a seven-game series.
The game was never really close, with San Antonio opening up a 19-point halftime lead en route to clinching the series in a 39-point road win. "We'll figure it out".
San Antonio will have the advantage over Golden State inside with 6-foot-11-inch LaMarcus Aldridge and 7-foot Pau Gasol, along with a big coaching edge in Gregg Popovich over Mike Brown.