With fans in Denver cheering him on, he gained the needed 10th assist with 4:17 remaining in the fourth quarter.
The Nuggets (38-42) needed to win their last three games and hope the Portland Trail Blazers dropped their last two, but instead Denver took a second heartbreaking loss to the Thunder this season.
Westbrook ended his historic day with a 36-foot dagger, finishing with 50 points, 16 rebounds and 10 assists to pass Hall-of-Famer Oscar Robertson for most triple-doubles in an National Basketball Association season.
Westbrook now averages a triple double, being only the second player to do this, with 31.9 points, 10.4 assists, and 10.7 rebounds per game.
Israel Isolates Hunger Striking Detainees
The strike also comes at a hard time for the Palestinian Authority, whose leader, Mahmoud Abbas, is aging and unpopular. The hunger strike was orchestrated by Marwan Barghouti , who is also the head leader of this movement.
The defending champion Cavaliers and Boston Celtics are tied at the top of the Eastern Conference with two regular-season games remaining - but the Cavs hold the tiebreaker, should they finish level, after winning the season series.
Westbrook had 50 points, 15 rebounds and 10 assists, including the Thunder's final 13 points. "I thought winning is what this is about, period", said Harden, who had his 21st triple-double of the season in the Rockets win over the Kings on Sunday. Witnessing Russ's glorious late-game heroics as he carried the backbreaking weight of the Oklahoma City Thunder to a playoff spot was thrilling and now historic, so much so that the highlights demand revisiting. Also, Broadie showed multiple clutch plays and beating the Denver Nuggets with a three-point dagger.
After Jokic missed, Westbrook grabbed the rebound and the Thunder called timeout with 2.9 seconds left. But, Russell Westbrook has been straight up God-like.
Now that Russell Westbrook made history, his biggest priority is to make his team effective in the playoffs.
Neil Gorsuch confirmed by Senate as Supreme Court justice
Even the liberal New York Times acknowledged in its report on the nomination vote, that Gorsuch is indisputably qualified. Had Hillary Clinton won last November's election (as many polls indicated she might), the choice would have been hers.
But with his 10th assist and the triple-double locked down, Westbrook went to work on the Nuggets' 10-point lead.
Harden led the Houston Rockets to a 54-26 mark this season so far and has put up incredible numbers of his own, averaging 29.2 points, 8.1 rebounds and an NBA-leading 11.2 assists per contest.
As for if Westbrook will play Wednesday night against the Denver Nuggets, Thunder head coach Billy Donovan told reporters it had not be determined.
The Oklahoma City Thunder and the Minnesota Timberwolves do battle at the Target Center on Tuesday night.
Jakarta election: Ex-education minister takes lead over Ahok
The election is seen by some analysts as a test of secular democracy in the world's most populous predominantly Muslim country. With no majority victor , the election proceeded to Wednesday's runoff.