Victor Wembanyama has compiled 33 points, eight rebounds, five assists and three blocks and San Antonio held Oklahoma City to their second-lowest post-season total, beating the Thunder 103-82 in Game 4 to tie the Western Conference finals.

De'Aaron Fox had 12 points, 10 rebounds and five assists on Sunday (Monday AEST) for for hosts San Antonio, who have not lost three consecutive games all season. Stephon Castle and Devin Vassell added 13 points each.

Game 5 is Tuesday in Oklahoma City, followed by Game 6 on Thursday in San Antonio.

"The truth is that we had never been in this kind of situation before," Wembanyama said.

"It was our first deficit in a playoff series and we just responded. It was nothing amazing. It wasn't magic. We just did what we needed to do.

"The series is far from over ... We've got six more wins before we can rest."

Shai Gilgeous-Alexander had 19 points on 6-for-15 shooting for the Thunder.

Wembanyama took OKC'S 123-108 victory in Game 3 personally. The 7-foot-4 star from France said he needed to be better to make his teammates better. He was monumentally better in Game 4 — and so were the Spurs.

They limited the Thunder to 33 per cent shooting from the field, including just six for 33 on three-pointers.

After being outscored 76-23 in bench points in Game 3, San Antonio's reserves scored 30 points while limiting Oklahoma City to 34.

The Spurs had another hot start in Game 4 after opening the previous game on a 15-0 run. Unlike Friday's lopsided loss, the Spurs never relinquished that lead.

After blocking Jared McCain's layup under the rim, Vassell tossed an alley-oop pass to Wembanyama for a dunk as part of 16-0 run that gave San Antonio a 23-8 lead.

The Spurs held OKC to 38 points in the first half, tied for their second-lowest half in the past four regular and post seasons. The Thunder are 2-9 when they score less than 40 points in any half over the last five seasons.

Oklahoma City's franchise low is 65 points in a playoff loss to Memphis on May 3, 2014, and their second-fewest points had been 85 against San Antonio on May 21, 2014.

"We've played 12 playoff games. When you play 12 playoff games, they're not all going to be masterpieces," Thunder coach Mark Daigneault said.

"As much as you want to win, there's nights where you just don't have it for whatever reason."

With AP.