INDIANAPOLIS — Russ Smith matched his career high with 31 points to lead three Cardinals in double figures, and top-seeded Louisville overcame its toughest test yet in a 77-69 victory over Oregon on Friday night. Louisville has now won 13 straight and coach Rick Pitino improved to 11-0 in the regional semifinals of the NCAA Tournament.The 12th-seeded Ducks (28-9) managed to make a game of it late. After Louisville went up 66-48 with 9:01 left, Oregon made six straight field goals to close to 70-64 — the closest anyone’s been to the Cardinals in a couple of weeks. But Kevin Ware scored on a layup and Chane Behanan threw down a monstrous dunk to put the game out of reach.Still, Oregon is only the second team to be within single digits at the buzzer during Louisville’s run.Kyle Singler’s 15 points led five Ducks in double figures. But Oregon was hurt by foul trouble — Johnathan Loyd had three before halftime — and an off night by Damyean Dotson. The freshman scored 23 in Oregon’s victory over Saint Louis, but was 0 for 6 in the first half Friday. He finished with 12 points on 5-of-14 shooting.Louisville (32-5) plays Sunday against second seed Duke, a 71-61 winner over Michigan State.