San Antonio backup center Dave Corzine made four free throws in the last 30 seconds and secured a 115-113 victory over Seattle that gave the Spurs a 3-1 advantage in their National Basketball Association playoff series.

Corzine, who finished with 17 points and had some key rebounds in the stretch, put San Antonio ahead to stay with 30 seconds left with two free throws. Before that, the lead had changed 17 times and the score had been tied 23 times.

With 18 seconds remaining, Corzine sank two more free throws to make the score 113-110.

Mike Bratz, who also had 17 points, nine off three-point shots, added two more insurance free throws with six seconds left that put San Antonio ahead, 115-110.

Seattle's Gus Williams, who led all scorers with 33 points, made a three-pointer at the buzzer.

George Gervin got 10 of his 19 points in the fourth quarter as seven Spurs scored in double figures, led by Mike Mitchell's 22. Gervin's point total was his lowest of the playoffs.

"We've got guys who can score other than myself and we've got some clutch players on the team," Gervin said. "Corzine is a helluva center. He just doesn't get the recognition he deserves."

San Antonio has won each of its three games in the best-of-seven series by two points. The two teams meet again Wednesday night in Seattle.