PHOENIX — Roger Mason sank a 3-pointer from the corner at the buzzer to give the San Antonio Spurs a 91-90 victory over the Phoenix Suns today.

The Suns had taken the lead on Grant Hill's layup on an out-of-bounds play with 4.3 seconds to go. Tony Parker drove toward the basket for San Antonio and threw to Mason, who was wide open because defender Jason Richardson was late getting there.

Parker scored 27 and Tim Duncan had 25 points and 17 rebounds as the Spurs won their fourth straight. Amare Stoudemire had 25 points and 13 rebounds and Shaquille O'Neal 23 points and 12 boards for the Suns, who led most of the afternoon but never by more than eight in the second half.

Hill added 16 for the Suns, the last two coming on the same play Phoenix used to beat Orlando this season. After a timeout, he inbounded to Stoudemire, than ran to the baseline and toward the basket, where Stoudemire found him for the uncontested layup.

But the Spurs had the last shot. When Parker drove toward the basket, Richardson came in to help on defense. That left Mason, a 48 percent 3-point shooter, alone for the winner, sending San Antonio to its 10th win in its last 12 games.

O'Neal was 9-of-16 at the foul line to become the only player other than Wilt Chamberlain to miss 5,000 career free throws.

Steve Nash had 13 points. His eight assists made him the 13th NBA player to reach 7,000 for his career. His coach Terry Porter is among the other 12.

Stoudemire's three-point play to start the fourth quarter put the Suns ahead 79-71. But the Spurs stayed close and Parker scored twice, on a layup and 18-footer, to give San Antonio its biggest lead, 88-84, with 3:27 to go. Phoenix led nearly all the game but never by more than eight in the second half.

Richardson's 3-pointer from the corner cut to 88-87 with 3:07 to go then, after a flurry of missed shots, Parker was called for a technical and Nash's free throw tied it at 88-88 with 1:01 remaining.

The Suns hit their first five shots to go up 11-0 on O'Neal's dunk and led 23-10 after Richardson made one of two free throws. But the Spurs scored the next eight, then started the second quarter with a 9-2 run to cut the lead to 29-27 on Duncan's baseline hook with 8:02 left in the half.

O'Neal scored the first six points, capped by a nifty spin move in the lane, in a 10-2 Phoenix run that boosted the lead to 41-31 on Grant Hill's layup on a pass from Matt Barnes 3:35 before the break. The Suns led 45-39 at the half.

San Antonio took its first lead with a 9-2 run, Duncan's 21-footer putting the Spurs up 54-52 with 6½ minutes left in the third quarter. Phoenix scored the next seven.

Coach Gregg Popovich employed the "hack-a-Shaq" strategy in the last minute of the third quarter, but O'Neal made 5-of-6 at the line to put the Suns ahead 76-71 entering the fourth.