Clemente was one of four Wildcats in double figures as Jamar Samuels had 14 points, Ron Anderson pitched in 12 and Fred Brown 10. K-State shot 42-percent for the game but turned the ball over 20 times on the night.
K-State (5-3) took a 38-35 lead at halftime as Clemente hit a running three pointer just as time expired in the first 20 minutes.
The Wildcats took a 40-37 lead early in the second half but the Ducks then went on a 10-0 run to retake the lead, capped by a three-pointer from Tajuan Porter. Down 54-46, Kansas State battled back several times in the second half and a Samuels free throw with 2:48 remaining closed the gap to one at 69-68.
With the Ducks ahead, 71-68, Clemente drew an offensive foul with :29 remaining to negate a made field goal and Oregon sealed the win with four free throws down the stretch.
Porter scored a season-high 28-points to lead the Ducks, while Garrett Sim added 16 points and LeKendric Longmire had 13 for the 4-4 Ducks.