SEATTLE — Washington tried to take a page from Washington State's defensive book, but it was the Cougars showing just how it's done in the final minutes when it counts the most.

Aron Baynes scored 16 points, Kyle Weaver scored 11 of his 13 in the second half, and No. 4 Washington State beat Washington 56-52 on Saturday night, its sixth straight win over the Huskies in the Pac-10 opener for both teams.

It's the Cougars' longest win streak over their rival since winning six straight in 1941-42. And much like those games 66 years ago, this one was a physical, grind-it-out affair — just the way the Cougars like it.

Trailing 48-45 with 6:20 to go, the Cougars (13-0) scored 11 of the final 15 points, using an 8-0 spurt to take the lead on Taylor Rochestie's runner with 3:04 left. From there, it became a free-throw shooting contest, with Weaver making three of four in the final 30 seconds.

Tim Morris led Washington with 16 points, but the transfer from Stanford was scoreless over the final 14 minutes. Jon Brockman added 14 points and 17 rebounds, but the Huskies (9-5) saw their five-game win streak snapped.

Washington had opportunities to tie or take the lead in the closing moments. Ryan Appleby had a 3-point attempt partially blocked, then saw his layup swatted into the first row by Baynes. Morris also missed in the lane with less than 90 seconds left.

Brockman failed to pull Washington even when he missed a free throw with 28 seconds left. Weaver got the rebound and was instantly fouled, but split his two free throws, leaving the Cougars with a 54-52 lead with 27.2 seconds remaining.

Washington immediately went to Brockman, but his spinning jumper in the lane was challenged by the 6-foot-10 Baynes and came up short. Weaver was fouled and hit two clinching free throws.

Derrick Low added 11 points, and Daven Harmeling hit two key 3-pointers off the bench in the second half, after the Cougars went 0-for-8 from behind the arc in the first half.

Washington led by five early in the second half, but the Cougars rallied behind Weaver, who scored eight points during a hard-fought 6-minute span.