Riley Nelson, running and throwing at his best, and worst, completed 25 of 36 passes for 285 yards and two touchdowns as the blue-clad Cougars improved to 3-1 all-time against WSU in front of 57,045 fans.
"It was just a cool, cool night for our players and for our program to play football," Mendenhall said. "So, good start."
If there was a downer for BYU, besides the penalties, it was that star receiver Cody Hoffman left the game in the first quarter with a quad contusion and never returned. He caught three passes for 46 yards before taking a hard hit to the left thigh on a 12-yard reception late in the quarter.
Kaneakua Friel, the tight end who won the job the last week of spring camp, caught a pair of touchdown passes in the first half and finished with 101 receiving yards as BYU rediscovered a position that has been underutilized the past few seasons.
"I liked the tempo we played with," Mendenhall said.
If there was another element of the game to get nitpicky about for BYU, it was the failure to score touchdowns in the red zone. BYU settled for four field goal attempts by Riley Stephenson filling in for the injured Justin Sorensen after driving to the WSU 11-, 3-, 4- and 5-yard lines. Stephenson made three of the four tries.
Defensively, Uona Kaveinga and Jordan Johnson came up with interceptions for BYU and David Foote blocked a punt.
BYU continually shot itself in the foot in the first half, or it might have held new WSU coach Mike Leach's Air Raid attack scoreless in the first 30 minutes.
The Cougars were penalized seven times for 87 yards in the first half alone (10-for-112 in the game), but had a 24-6 lead at the break.
Both WSU scoring drives which ended with field goals in the first half were kept alive by personal fouls, unsportsmanlike conduct and pass interference penalties on the blue-clad Cougars.
Washington State had its best drive on its first possession, but Kaveinga intercepted a pass tipped by Daniel Sorensen to thwart the drive.
BYU had 294 total yards in the first half to 111 for WSU and finished with 426 yards. The visitors had just 224 yards, including minus-5 on the ground.
"It was fun to watch this team play tonight," Mendenhall said. "Hungry is a good word for it."
After Kaveinga's interception, BYU promptly drove 80 yards in 10 plays for a touchdown, a 7-yard strike from Nelson to Skyler Ridley. It was Ridley's first career catch.
On BYU's next possession, the Cougars drove 71 yards and scored on fourth-and-1 when freshman Taysom Hill was inserted into the game. He threw an 18-yard touchdown pass to Friel on his first college pass, with Nelson having lined up as a receiver.
Andrew Furney got WSU on the board with a 47-yard field goal after personal fouls on BYU's Joe Sampson and Johnson accounted for 30 of the drive's 57 yards.
BYU put together a 16-play drive for 65 yards, but could manage only a Stephenson field goal. After a three-and-out, BYU added to its lead when Nelson threw a 25-yard pass to Friel, giving the Cougars a 24-3 advantage and control of the game.
Washington State added another field goal as the first half concluded, a 40-yarder by Furney. An apparent WSU touchdown the play before the field goal was negated by a holding call. BYU players were flagged for taunting, pass interference and grabbing a facemask on the drive.
Storylines BYU 30, Washington State 6
R IN SHORT • BYU wins its sixth straight season opener, overwhelming Washington State in Provo.
KEY STAT • Washington State has just 146 yards of offense through three quarters.