Jackson Shelstad scored 17 points on 7-of-11 shooting to help fifth-seeded Oregon trounce 12th-seeded Liberty 81-52 on Friday night in East Region first-round play of the NCAA Tournament at Seattle.Nate Bittle contributed 14 points and 10 rebounds and Keeshawn Barthelemy added 10 points for the Ducks (25-9), who never trailed while winning for the ninth time in the past 10 games.Oregon will play fourth-seeded Arizona on Sunday for a spot in the Sweet 16. The Ducks and Wildcats were part of the same conference until both teams exited the Pac-12 before the 2024 football season.Zach Cleveland had 10 points, six rebounds and six assists for Liberty (28-7), which lost for just the second time in the past 13 games.Oregon has won at least one game in each of its last nine NCAA Tournament appearances.The Ducks shot 54.4 percent from the field, including 10 of 21 from 3-point range. TJ Bamba had four of Oregon’s 11 steals.Liberty made 32.8 percent of its shots and connected on a dismal 8 of 37 from behind the arc.Shelstad scored 15 first-half points to help Oregon hold a 44-20 lead at the break.Shelstad tallied eight points in a game-opening 18-2 burst as the Ducks immediately took control.Shelstad buried a jumper midway through the half to make it 27-8.