Billy Ray Bates scored seven of his 24 points in overtime tonight to lead the Portland Trail Blazers to a 111-104 overtime victory over the Bullets.

The Blazers scored the last seven points of the overtime period to snap the Bullets' four-game winning streak and start Washington' seven-game road trip on a sour note.

The two teams had traded baskets in the overtime until, with the score tied, 104-104, Mitch Kupchak was called for a foul. It was all the leeway Portland needed. They opened up a 108-104 lead, and the Bullets called timeout.

Don Collins drove around the Trail Blazer defenders on the Bullets' next possession, but he stepped out of bounds. Bates was fouled by Elvin Hayes as he scored at the other end, and Portland led, 111-104.

Washington fed Kevin Grevey twice for three-point attempts in the closing seconds, but he missed them both. Portland rebounded and ran out the clock.

Greg Ballard had a career-high 38 points, but he was the only Bullet to score in the overtime period. He had six points.

The Bullets face the Seattle Super-Sonics in the Kingdome Wednesday night (WDCA-TV-20, 10:30 p.m.).

Grevey supported Ballard with 25 points, but he didn't score a point after the 7:35 mark of the third period.

Portland's Mychal Thompson sent the game into overtime with a driving basket with 1:15 left in regulation.

The Blazers had the ball with 23 seconds left and got three shots at the basket, but couldn't score. But they made up for it in the extra session.

The Bullets scored 11 straight points late in the second period to move from seven points down to a 50-46 lead.

Collins started the spurt with a baseline jumper. After a Portland turnover, Hayes made a free throw.Kevin Porter's basket on a twisting drive down the middle cut Portland's lead to 46-44. Ballard joined the scoring spree with two consecutive 18-footers after back-to-back Portland turnovers, and the Bullets led, 48-46.

Porter stole a Portland pass and fed Austin Carr fo a fast break layup for the final points in the Bullet rally.

Portland finally retaliated on a Thompsonn dunk as the half ended.

Portland turned the ball over on seven of its last 12 possessions, but still managed to stay within two at halftime, 50-48.

The Bullet offense in the first few minutes of the game was all Grevey. The guard's long jumpers accounted for 10 of the Bullets' first 20 points as they opened a 20-10 lead.

Grevy made all six shots he took in the first period and three of them were from beyond 20 feet. His last basket of the quarter gave the Bullets a 26-20 lead, but Portland was gining momentum.

Jim Paxson scored a pair of basekts and Bates came off the bench with an 18-foot bomm and a crunching dunk to enable the Trail Blazers to tie the score, 28-28, by the quarter's end.

Portland began the second period with a 6-0 scoring spurt with Mike Harper, Ransey and Bates scoring.

Collins broke the Bullet drought with a jump shot.

Grevey made a 22-footer while Bates was knocking him down and he canned a 20-footer before running out of gas midway through the period.

He sat down with 21 points on eight-of-10 with shooting from the field.

Porter, meanwhile, had 10 first-half assits.

The player who made the biggest difference for Portland in the first half was former American University star Kermit Washington. He replaced Tom Owens, who was playing poorly, and shut down Hayes. Washington got six rebounds and four assists in the first half.

Ownes made two free throws and then scored on a layup on Portland's first two possessions of the third period to give the Trail Blazers a 52-50 lead, but the Bullets responded with a 15-1 scoring binge as Ballard took over the assignment of long-range bomber. He had nine of the 15 and Grevey had four.

Ballard followed a three-point play with a 20-footer as the Bullets moved to a 15-point lead midway through the quarter. Ballard scored 16 points in the first seven minutes of the second half.

Ballard played at the University of Oregon in nearby Eugene and the Portland fans, who cheered when he was introduced before the game, started groaning every time he touched the ball. In one stretch of the third period, Ballard scored 11 of 13 Bullet points with five baskets coming on those long jumpers.