Dallas ? After all the incredible shots Dirk Nowitzki has hit this postseason, it was his vintage stuff — a straightaway three-pointer and a pair of free throws — that put the Dallas Mavericks back in the NBA finals.

Nowitzki continued a tremendous roll for him and the Mavs by capping yet another fourth-quarter comeback with a go-ahead three-pointer with 1:14 left, sending the Mavericks to a 100-96 victory over the Oklahoma City Thunder on Wednesday night that closed out the Western Conference finals in five games.

After clawing back from down 15 with 5:04 left in Game 4, the Mavericks were down by six with 4:37 left in this one when they rallied again, outscoring the Thunder 14-4 the rest of the way.

Dallas has never won a championship, and neither has any of its players. Nowitzki and Jason Terry were part of the only Mavericks team to make the finals, in 2006. They were up, 2-0, and leading late in Game 3, but lost the series to the Miami Heat in six games.

Dallas could get another crack at the Heat.

LeBron James and Miami lead the Chicago Bulls, 3-1, in the Eastern Conference finals. If the Heat win tonight, the finals will begin Tuesday in Miami. If the Bulls win tonight, the finals will begin next Thursday in the East winner’s city.

“All I can tell everybody is, we ain’t done yet,” Mavs owner Mark Cuban said during the on-court trophy presentation ceremony. Seconds later, fans began chanting, “Beat the Heat,” drowning out coach Rick Carlisle’s on-court interview.

As fans were starting to clear out, Terry walked down the tunnel carrying the Western Conference championship trophy over his head.

Nowitzki and Shawn Marion each scored 26 points and were at their best in the fourth quarter. Nowitzki scored nine in the final period, and Marion had 15. J.J. Barea added 14, Terry scored 12 and Jason Kidd had 10 assists and seven rebounds in a victory that set off the biggest on-court celebration in franchise history.

The only other time the Mavs made the finals, they won in Phoenix. This time, the home folks got to enjoy it, including franchise founder Don Carter.