Colorado (23-10) led by as much as 11 before the Bears made a late run to make it close.
The Buffaloes went ahead 58-54 when Booker hit two free throws with 12.1 seconds left, but Eli Stalzer only hit 1 of 2 free throws after Justin Cobbs scored on a layup. Cal raced down the floor to get off a potential tying 3-pointer, but Cobbs shot came up short.
Josh Scott scored 11 points for the Buffaloes, who will face No. 4 Arizona in the semifinals Friday night.
Cobbs finished with 21 points, five assists and four rebounds. Tyrone Wallace added 13 points for Cal (19-13), which shot 5 of 22 from 3-point range.
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