Kelly had eight points in the first five minutes of the second half when he and Shepherd combined for a 12-1 Golden Bear run. Then they scored the final 13 Cal points over the last four minutes to hold off the Beavers.
Shepherd scored 25 points and Kelly 20 for the Golden Bears (4-4). Grant Anticevich added 12 points. Kelly grabbed 13 rebounds for his fourth double-double and Shepherd eight boards as Cal had a 42-24 rebounding advantage.
The Beavers (1-7) had scored the last 12 points of the first half to pull within 34-33. But Kelly and Shepherd's 12-1 pushed the lead to 46-34.
Shepherd also scored inside to cap a 6-0 burst that made it 56-40 with 8:37 to play. Oregon State outscored Cal 11-2 to get within 60-53 with 4:10 to play but Kelly and Shepherd both had baskets down the stretch and combined to go 9 of 10 from the foul line.
Cal shot 54% in the second half went Kelly went 6 of 7 and scored 16 points and Shepherd was 5 of 9.
Oregon State went 12 of 31 (39%), including 1 of 8, from 3-point range. The Beavers were also outscored by 10 at the foul line.
Cal plays at Utah on Sunday when Oregon State is home against No. 11 Arizona.
For more AP college basketball coverage: https://apnews.com/hub/college-basketball and http://twitter.com/AP--Top25
Weber State beats Idaho State 78-61
— Koby McEwen and Seikou Sisoho Jawara scored 23 points apiece as Weber State defeated Idaho State 78-61 on Monday night.
Fausett scores 21 to lift S. Utah past Portland St. 86-76
— Maizen Fausett matched his season high with 21 points plus 10 rebounds as Southern Utah topped Portland State 86-76 on Monday night.
Williams scores 20 to lead UNLV past San Jose St. 81-56
— Donovan Williams had 20 points as UNLV romped past San Jose State 81-56 on Monday night.