The Spurs dominated the final three quarters to earn their ninth straight victory over Sacramento, 99-79, and 12th overall Friday at Sleep Train Arena. The result maintained their 1 1/2-game lead over Oklahoma City and Indiana atop the NBA standings. The Spurs (52-16) were up 10 entering the fourth quarter when Marco Belinelli erupted for 13 of his team-high 17 points to salt the game away. He led six double-figures scorers on a night the Spurs shot just 39 percent. Kawhi Leonard added 15 points and seven rebounds. The Spurs’ streak is the longest in the NBA this season. Tim Duncan played 34 minutes, leaving his availability for Saturday’s game at Golden State in doubt. With 31, Leonard was the only other Spur to crack the 30-minute mark.