After grabbing 17 rebounds in the team's 81st game of the year to officially put the team in the playoffs, Russell Westbrook needs 16 rebounds in the final game to average a triple double for the season for the second straight year. San Antonio improved to 33-8 at home this season and now hold the number five seed in the West due to tiebreakers over the Thunder.
The Heat led OKC 81-76 after three quarters before the Thunder finally took its first lead, 85-84, on a Corey Brewer layup with 10:28 remaining.
Last season, Westbrook became the first person since Oscar Robertson in 1962 to average a triple-double, finishing with 31.6 points, 10.4 assists and 10.7 rebounds per game.
New Orleans Pelicans forward Anthony Davis, left, shoots as Los Angeles Clippers centre DeAndre Jordan defends during the first half of an NBA basketball game in Los Angeles.
With just one regular season game remaining, the Cavaliers will likely need to defeat NY again on April 11 if they are to have any chance of sneaking past the in-form Philadelphia 76ers for the third seeding. In fact, the Pelicans can still move up to the number four seed if they beat the Spurs on Wednesday, and if Utah lose to Golden State on Tuesday and Portland a day later.More news: Tallahassee women rally to close gender wage gap
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Elsewhere, Kevin Love and LeBron James combined for 54 points as the Cleveland Cavaliers kept alive their hopes of snagging third place in the Eastern Conference with a 123-109 win over the New York Knicks.
James finished with 26 points and contributed 11 assists in a comfortable win for the 2016 National Basketball Association champions.
The Pistons are ready for the season to be over.
Andre Drummond (Achilles) sat out and Stanley Johnson registered a minus-21 and was two for 10 shooting in a 108-98 loss to the Raptors.