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Provo • Just when you thought the national spotlight on Tanner Mangum and the BYU football team could get no brighter after a pair of improbable victories in the final seconds over perennial power Nebraska and No. 20 Boise State comes a game this week against the Pac-12's UCLA and its hotshot rookie QB, Josh Rosen.

At the Rose Bowl.

Near Hollywood.

Pitting a pair of top-20 teams.

The Cougars' September to Remember continues Saturday at 8:30 p.m. MDT as BYU, which jumped from No. 27 to No. 19 in the AP Top 25 and to No. 22 in the Amway Coaches Poll, tests its luck and last-minute moxie against the No. 10 Bruins.

The game featuring a pair of 2-0 teams with quarterbacks who have caught the nation's eye — for almost entirely different reasons — will be televised by Fox Sports 1.

"I think these guys will play hard against whoever we play against," BYU coach Bronco Mendenhall said late Saturday night after the Cougars scored 21 points in the fourth quarter to upset the Broncos. "We can still improve, but it is just fun to watch them. They pull for each other and make critical plays."

While Mangum was working his late-game magic for the second-straight week, Rosen was continuing to rack up impressive numbers for the Bruins. He completed 22 of 42 passes for 223 yards as UCLA racked up 526 yards and buried UNLV 37-3 in Las Vegas on Saturday night.

Through two games, Rosen has completed 50 of 77 passes for 574 yards and four touchdowns.

Mangum, who relieved Taysom Hill after the senior suffered a season-ending Lisfranc foot injury in the opener at Nebraska and delivered the 42-yard Hail Mary toss to Mitch Mathews that thrust him into the nation's consciousness, is now a combined 24 of 39 for 420 yards and three touchdowns, with two interceptions.

The stage is set for a rookie QB showdown nobody saw coming when the season began, although the Cougars were thinking of anything but the Bruins after knocking off Boise State 35-24 with another come-from-behind win on Saturday night.

"It was just good to come out with a win more than anything," said Mangum, who somehow found Mitchell Juergens for a 35-yard touchdown pass on fourth-and-7 with 45 seconds remaining in the game. "The guys around me are so resilient-they fight to the end. It definitely was not the ideal situation but you just have to keep playing and keep fighting. The guys around me just made the plays and made it happen."

More tributes to the 22-year-old native of Eagle, Idaho, who returned from his two-year LDS mission to Chile on June 3 poured in on Sunday, and FoxSports.com columnist Stewart Mandel put Mangum atop his Heisman Top 5, saying Mangum has remarkably delivered two Heisman moments already.

"Unbelievable," Mandel wrote.

Will it all come crashing down this Saturday?

The Bruins have won 10 straight non-conference games since losing to Baylor in the 2012 Holiday Bowl and have won all 11 of their regular-season nonconference games under Jim Mora by an average margin of 21.4 points.

The Cougars came out of Saturday's win over Boise State relatively injury-free, but could possibly be without sophomore offensive lineman Ului Lapuaho vs. UCLA. ESPN2 cameras caught Lapuaho throwing a below-the-belt punch at BSU defensive back Chanceller James while the two wrestled for a loose ball.

Against Houston two years ago, BYU receiver Skyler Ridley was suspended for half a game by the College Football Officials Association (CFOA) for targeting a linebacker while blocking him. Independent BYU answers to the CFOA on disciplinary matters.

Without starting nose tackle Travis Tuiloma, out for 4-6 weeks with a knee injury, Logan Taele started at NT and the Cougars held Boise State to just 64 rushing yards on 31 attempts.

Safety Kai Nacua returned after serving a one-game suspension and made three interceptions to tie a school record.

"It was great to have Kai Nacua back," Mendenhall said. "He changed the game. The range that he covers and the plays he made, that's really who he is. I'm really excited for him regarding all the scrutiny he's been under. For him to be able to come out and play that way, it is fitting [because] he got to represent who he is and how hard he's worked to be back on our team."

Twitter: @drewjay —

No. 19 BYU at No. 10 UCLA

O Saturday, 8:30 p.m. MDT

TV • Fox Sports 1