PORTLAND, Ore.—Luka Doncic had 15 points, 10 rebounds, and 15 assists for his sixth triple-double this season, and the Dallas Mavericks led wire-to-wire in a 132–112 victory over the Portland Trail Blazers on Wednesday night. It was Doncic’s franchise-leading 42nd career triple double. He’s one away from matching Fat Lever for 10th on the NBA all-time list. “Everything starts with Luka Doncic,” said Kristaps Porzingis, who had 22 points for the Mavs. “Everything becomes much easier with him on the court.” Jalen Brunson added 20 points and 11 assists for Dallas, which led by as many as 23 points and had seven players finish in double figures. Anfernee Simons led Portland with 23 points and CJ McCollum added 20. Both teams were playing the second game of a back-to-back. The Mavericks fell 130–92 to the Golden State Warriors on Tuesday night—a loss that stung because Tim Hardaway Jr. fractured a …