Lead scorer Tyler Haws was well off his 22.6 scoring average, putting up nine points on 4-of-13 shooting. Iowa State's top defender, Chris Babb, shadowed him throughout, rarely letting Haws gain separation.
"He's not trying to take chances. He plays you straight up and makes you earn everything you get," Haws said. "They're tough defenders big, strong dudes."
Those big, strong dudes outworked BYU in building a 48-37 halftime lead. Iowa State (5-2) was 7 of 14 on 3-pointers in the first half and led by double digits the entire second half.
"At a certain part of the game, they kind of broke us and guys stopped playing hard, which is very frustrating," Haws said.
Clyburn, who played at Utah for one season (2010-11) and then transferred after coach Jim Boylen was fired, made four 3-pointers and was 10 of 11 at the free-throw line. He scored 22 points before halftime and left the game to an ovation with four minutes left.
"Will was terrific," Rose said. "It's hard to get him in a hurry. He plays with a great pace and with great confidence. I thought we did a better job against him in the second half, but in the first half he torched us."
For the third straight game, BYU walk-on Craig Cusick started at point guard and Matt Carlino came off the bench.
In the opening three minutes, Cusick was overmatched by counterpart Korie Lucious. Lucious, who had 12 points and nine assists, was fouled by Cusick on a drive and later blew past him for a layup that Lucious missed. After another missed shot from Iowa, Lucious stole the ball from Cusick and the turnover turned into an alley-oop dunk that induced a lusty roar from the crowd of 13,739.
Cusick did not score and had three assists and one turnover in 22 minutes.
Rose made the move after Carlino shot just 1 of 14 with five assists in losses to Florida State and Notre Dame. He wouldn't say if the approach would continue, but he felt Carlino, who had 12 points, three assists and one turnover, was steady.
"I thought Matt played within himself pretty well. It was a tough matchup for our point guards because [Lucious] is so quick," Rose said.
Up next for the Cougars are a couple of in-state rivalry dates at the Marriott Center. Utah State comes calling Wednesday, and Utah visits Saturday.
R Iowa State's Will Clyburn, a transfer from Utah, scores 32 points against BYU.
• BYU sophomore Nate Austin has a season-best eight points and five rebounds. He is the only Cougar to shoot above 50 percent (3 of 5).
• The Cougars' 62 points are a season low.