OKLAHOMA CITY (Interstat) — Victor Wembanyama had 41 points and 24 rebounds, Dylan Harper finished with 24 points, 11 rebounds, six assists and a team playoff-record seven steals, and the San Antonio Spurs beat the Oklahoma City Thunder 122-115 in a double-overtime classic to open the Western Conference finals Monday night at Paycom Center.

Wembanyama sealed the victory with a pair of dunks in the final minute of the second overtime, one of them a three-point play that gave the Spurs a 117-114 lead with 1:01 left. He then blocked Jalen Williams’ shot with 17.9 seconds remaining and grabbed the rebound, allowing Harper to add two free throws. San Antonio stole home-court advantage and beat the Thunder for the fifth time in six meetings this season.

The Spurs, who were without guard De’Aaron Fox because of ankle stiffness, played most of the game with a seven-man rotation. Stephon Castle added 17 points, six rebounds and 11 assists despite committing nine turnovers. Devin Vassell and Keldon Johnson each scored 13, and Julian Champagnie had 11 points and nine rebounds. San Antonio shot 47.4 percent from the floor, 36.8 percent from three-point range and 84.2 percent from the free-throw line.

Alex Caruso led Oklahoma City with 31 points, hitting nine of 14 from the field including seven three-pointers. Shai Gilgeous-Alexander had 24 points, three rebounds and 12 assists but shot only 8 of 22. Jalen Williams added 26 points and seven rebounds, while Chet Holmgren scored eight points with eight rebounds. The Thunder shot 43.9 percent from the floor, 33.3 percent from deep and 82.1 percent from the line.

The game featured 13 lead changes and seven ties. Oklahoma City raced to a 27-26 lead after the first quarter, but San Antonio dominated the second period, outscoring the Thunder 24-17 to take a 50-44 halftime edge. The Spurs extended the lead to 73-70 after three quarters, then the two teams traded baskets in a frantic fourth.

With the score tied at 99 in the final seconds of regulation, Gilgeous-Alexander hit a layup with 3.1 seconds left to put Oklahoma City ahead 101-99. But Wembanyama answered with a turnaround jumper at the buzzer to force the first overtime.

In the first extra period, Caruso connected on a three-pointer to give the Thunder a 104-101 lead with 2:21 left. Williams followed with a dunk to make it 106-101. Wembanyama then hit a running 27-foot jumper with 27 seconds left to cut the deficit to 108-106, and after a missed Williams three-pointer, Harper grabbed the rebound and called timeout. But San Antonio could not get a shot off, sending the game to a second overtime.

The second extra period belonged to Wembanyama. After Cason Wallace hit a three-pointer to tie the score at 111 with 2:24 left, Harper answered with a layup and a free throw. Wembanyama then threw down a dunk and a free throw to make it 117-114. After Williams hit a three-pointer to cut it to 117-114, Wembanyama dunked again, drew a foul and made the free throw for a 120-114 lead. He finished with 14 points in the second overtime alone.

Harper’s seven steals broke the previous Spurs playoff record of six, set by Kawhi Leonard in 2014. The rookie guard also had 11 rebounds. Wembanyama’s 24 rebounds were a career playoff high.

The Spurs improved to 71-24, while the Thunder fell to 72-19. San Antonio’s victory avenged a 119-98 loss in Oklahoma City on Jan. 13, one of only two wins for the Thunder in the season series. The Spurs had beaten the Thunder 116-106 in San Antonio on Feb. 4 and 130-110 on Dec. 23, and had won 117-102 on Christmas Day.

Oklahoma City had not lost at home since March 29, a span of 11 consecutive victories at Paycom Center. The announced attendance was 18,203.

The most critical sequence came in the final two minutes of the second overtime. After Williams’ three-pointer pulled the Thunder within 117-114 with 1:21 remaining, San Antonio called a timeout. Wembanyama took a pass from Castle and exploded to the rim for a one-handed dunk, drawing a foul on Holmgren. He completed the three-point play to make it 120-114 with 1:01 left. On the ensuing possession, Gilgeous-Alexander drove and dished to Williams, but Wembanyama met him at the rim and swatted the shot away. Harper grabbed the rebound, was fouled and made two free throws with 14.5 seconds left to seal the game.

Wembanyama, who had struggled with foul trouble in the fourth quarter and first overtime, finished 12 of 23 from the floor and 14 of 16 from the line. He played 49 minutes.

Caruso’s 31 points were a career high for a playoff game. He made seven three-pointers, matching his season high. Gilgeous-Alexander played 51 minutes but could not find his rhythm, missing 14 of 22 attempts.

The game went under the total of 237 points. Interstat’s game simulator had projected a final score of Oklahoma City 121, San Antonio 104, and its Elo system gave the Thunder a 66.5 percent probability to win. Oklahoma City was installed as a pregame favorite with a spread of -6. The over/under line was 217.5.