SEATTLE (Ticker) -- Despite another mammoth effort by Ike Diogu, Arizona State could not put an end to Washington's home winning streak.

Tre Simmons tied a career high with 29 points and Nate Robinson added 21 as No. 13 Washington extended their home streak to 21 games with a 90-82 triumph over Arizona State in a Pac-10 Conference matchup.

Entering with a conference-leading average of 22.2 points per game, which ties him for seventh in the nation, Diogu nearly was unstoppable, scoring 24 of his 31 points in the second half to stretch his run of double-digit performances to 87. He was 7-of-13 from the floor and 17-of-18 from the free-throw line while pulling down 15 rebounds.

"He does it every time," Arizona State coach Rob Evans said. "Ike is a tremendous talent and a tremendous player. He is an even better person than he is a player. He is a great player and comes to play every night."

"Ike Diogu was just phenomenal, that's all I can say about him," Huskies coach Lorenzo Romar said. "That kid is a heck of a player."

But Simmons was up to the challenge, scoring 21 of his 29 points in the final 20 minutes as Washington (22-4, 12-3 Pac-10) held off a late charge to raise its record to 13-0 at Bank of America Arena this season.

Will Conroy scored 13 points and Bobby Jones added 12 for the Huskies, who remain 1 1/2 games behind No. 8 Arizona in the conference standings.

"They are a dangerous basketball team," Evans said. "Not just Tre Simmons, they are all good players. They have got talented athletes. ... That is why they are ranked as high as they are."

Kevin Kruger scored 17 points while Jason Braxton and Steve Moore chipped in 10 apiece for the Sun Devils (18-10, 7-9), who have dropped four straight to the Huskies.

Simmons staked Washington to an 8-2 lead with a pair of 3-pointers and a jumper from the top of the key with 18:12 to go in the first half. The senior guard attempted the Huskies' first six shots of the game.

With Washington holding a 24-18 advantage after a dunk and jumper by Brandon Roy, Arizona State went on an 11-0 run to take its first lead of the contest with 7:15 to go. Moore scored five points and Diogu chipped in four during the burst.

"I don't know who we were out there, but they were like Joe Frazier," Romar said. "They just kept coming at us and they played at a very high level."

Trailing, 31-26, following a dunk by Diogu, the Huskies turned to Robinson, who outscored the Sun Devils, 11-2, during a 1:52 span to restore Washington's lead.

Diogu and Simmons - who was shaken up early in the second half but returned shortly thereafter - began their showdown when the Arizona State forward sank a pair of free throws with 19:14 remaining. Simmons made two 3-pointers and Diogu converted two more foul shots before Roy crashed the party with a jumper with 16 minutes to go, giving Washington a 52-45 bulge.

"I wasn't really worried about (Simmons' injury). We knew that he would bounce back," Romar said.

Simmons and Diogu traded baskets and, after Moore made 1-of-2 free throws, Simmons scored the next four points on a foul shot and a 3-pointer to give the Huskies a 58-48 cushion with 13:53 to go.

Diogu capped the bizarre stretch with four free throws, pulling the Sun Devils within 58-52 with 12:07 remaining.

"Ike was working extremely hard to get open, and we were getting the ball to him,' Evans said.