How it happened: Darren Collison didn’t get enough help.
Collison scored a season-high 32 points to give the Mavericks a chance to pull off a shocking upset over the defending Western Conference champions. He had 27 points -- six more than his previous season high -- midway through the third quarter and didn’t get another bucket until a hurried, off-balance, buzzer-beating 3-pointer that sent the game into overtime.
But Collison, the point guard who has been yo-yoed in and out of the starting lineup, didn’t get much support from the Mavs’ stars.
O.J. Mayo’s slump continued with a season-low-tying four-point performance. He was 1-of-7 from the floor and committed six turnovers, including a couple of critical ones in the final minute of regulation and overtime. Mayo had a chance to tie the game with 33.2 seconds remaining after being fouled on a 3-point attempt, but he made only one of the three free throws.
Dirk Nowitzki, who came off the bench again in his second game of the season, scored only nine points on 3-of-11 shooting in 26 minutes. Nowitzki, one of the league's elite closers for years, didn't score in the fourth quarter or overtime.
Oklahoma City’s superstars took turns taking over down the stretch.
Kevin Durant scored 13 of his 40 points in the fourth quarter to key the comeback for the Thunder, who trailed by eight at the beginning of the quarter and by as many as 11 in the second half.
Russell Westbrook, who was dominated by Collison for most of the game, scored eight of his 16 points in overtime. His jumper with 1:04 remaining gave the Thunder the lead for good.
What it means: The Mavs (12-17) will make the short flight home with a season-long four-game losing streak. Dallas has lost seven of its last eight games to fall to five games under .500 for the first time since April 2000. The Thunder (22-6) snapped its first two-game losing streak of the season.
Play of the game: Durant pinned Collison’s fast break layup on the glass and went coast to coast for a spectacular slam dunk over Chris Kaman during the third quarter. Durant took off from the dotted line and threw down a vicious one-hand slam despite Kaman’s challenge. It might have been even more spectacular than Durant’s high-flying and-1 dunk over ex-Mavs big man Brendan Haywood during the 2011 West finals.
Stat of the night: The Mavs had a halftime lead on the road for the first time in a month. They were up 45-43 at the break, the first time they led at the half away from home since Nov. 27 in Philadelphia.