San Antonio, which trails Oklahoma City by a game atop the Western Conference standings, kept pace with the Thunder after their defeat of Minnesota earlier Saturday.
Tony Parker and Kawhi Leonard netted 14 apiece in the victory.
Phoenix, meanwhile, saw its own playoff hopes take a hit. The Suns fell 1 1/2 games out of the West's final playoff spot despite Sebastian Telfair's 21 points off the bench.
Michael Redd added 13 for Phoenix.
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