Luka Doncic felt it was all about "energy, man" as the Dallas Mavericks put in a much-improved defensive showing to claw their way back into their Western Conference semi-finals series against the Phoenix Suns.

Speaking after the Game 2 defeat to the top-seeded Suns, superstar Doncic described the Mavs' second-half defensive showing as "horrible".

But it was a much different story for a desperate Dallas side on Friday as Doncic and Jalen Brunson starred in a 103-94 win to trim the deficit to 2-1.

Doncic finished with 26 points, 13 rebounds, nine assists and two steals, while Brunson put up a game-high 28 points – six more than he managed over the first two games.

After helping to spoil Chris Paul's 37th birthday and keep the Suns at bay, Doncic explained why he felt the Mavs were more on it from a defensive standpoint.

"Energy, man. The crowd gets you going. The energy and the execution were better. That's what we've got to do every game," he said, in quotes reported by ESPN.

"I knew I had to do better. I knew I could do better. I think I made a big jump on defense this year. The second half (of Game 2) was horrible by me, and I knew I had to get back to my team and play better defense.

"We're going to believe until the end. Somebody's got to get to four wins, and no matter if you're down or you're up, you've got to believe."

Head coach Jason Kidd said after the Game 1 defeat that Doncic did not get enough support from his team-mates. He had a different view this time around.

"Everybody joined the party," Kidd said. 

"They helped out on both ends. Luka was great defensively. He participated, too. It puts us in a different position when that happens."

For Brunson, the target now is maintaining that same standard when Dallas aim to tie things up in Game 4 on Sunday.

"I found a way to bounce back tonight," Brunson said. 

"I just can’t be satisfied with this. Sunday’s going to be another brutal game. I have to bring the same energy, the same intensity, the same everything."