Luka Doncic lauded the belief in the Dallas Mavericks dressing room after playing a starring role in a 123-90 thrashing of the Phoenix Suns.

The Mavs advanced to the Western Conference finals, where they will face the Golden State Warriors, courtesy of a dominant showing in Game 7 against the top-seeded Suns.

Doncic had as many points as Phoenix in the first half, making a mockery of the Mavs' status as supposed underdogs.

And it came as no surprise to Doncic, who finished with 35 points on 12-of-19 shooting.

“I know we were the underdogs,” he said.

"Everybody had the Suns to win this one, but the whole locker room believed and that's what won us the game."

Asked whether he knew he alone had matched the home team's total first-half points tally, Doncic said: "Yeah, of course.

"I'm having fun. I always say when I'm having fun it is the way I best play.

"Honestly, I'm really happy, man. You can't get this smile off my face right now.

"I think we deserve this. We were playing hard the whole series – maybe a couple of games here we were not ourselves.

"But we knew we came here with a statement Game 7. We believed, our locker room believed, everybody believed, so I'm just happy."