Arizona still led, 20-9, at the time and extended its lead from there to 35-19 at halftime.
The Wildcats pushed the advantage to 43-21 with 16:47 left, but the pace of the game slowed down to the Cougars' advantage and they struck back with a 10-0 run, capped by a 3-pointer from Brett Boese with 12:43 to go.
Parrom responded by driving the baseline for a reverse layup, but Washington State hung around until Parrom hit 3-pointers with 7:07 to go, 6:29 left and at the 5:55 mark.
NOTES: Washington State senior starting guard Mike Ladd, averaging 11.4 points and 5.9 rebounds per game, missed his fourth consecutive game because of a knee injury. ... Arizona reached the eight-million mark in all-time attendance at 40-year-old McKale Center. Arizona has drawn 8,009,738 fans in 627 games at McKale, an average of 12,775 per game, 88 percent of capacity. ... Arizona forward Brandon Ashley fouled out with 7:45 to go, finishing with seven points and three rebounds. ... Washington State's Royce Woolridge, who had averaged 16.9 points in his previous seven games, didn't make his first field goal until 14:37 remained in the game. He finished with six points.