NEW YORK—James Harden had 18 points, 10 rebounds, and 12 assists to power the Brooklyn Nets to a 117–91 rout of the Detroit Pistons on Sunday night. Harden is Brooklyn’s all-time leader with 13 triple-doubles, and joined Larry Bird for second on the NBA’s all-time list with 59. “James was great,” Nets head coach Steve Nash said. And he had help as Kevin Durant scored 23 points before being ejected in the third quarter. Durant became the third player in the Nets’ NBA history to score at least 20 points in the team’s first seven games to start a season. LaMarcus Aldridge added 16 off the bench. De’Andre Bembry contributed 15, and Joe Harris finished with 12. “We’ve shown some signs of being a really good team,” Harden said. “We’re nowhere near where we would like to be.” Whereas Brooklyn improved to 4–3 with its second straight win, Detroit fell …