Forbes hit his eighth 3-pointer with 2:33 remaining to put the Spurs back up 114-113.
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Doncic drained a career-best eight 3s on his way to 35 points, Tim Hardaway Jr. added 29 and the Mavericks beat Portland 120-112 on Friday night.
Danilo Gallinari scored 27 points and Shai Gilgeous-Alexander and Dennis Schroder each had 18 for the Thunder, who lost for the third time in four games.
LaMarcus Aldridge had 30 points and DeRozan added 24 for San Antonio, which lost for the third time in four games.
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