Pac-12 Power Rankings: Stanford, Oregon, USC, survive upset bids

Oct 31, 2015; Pasadena, CA, USA; Colorado Buffaloes wide receiver Nelson Spruce (22) catches a pass for a two-point conversion during the fourth quarter against the UCLA Bruins at Rose Bowl. The UCLA Bruins won 35-31. Mandatory Credit: Kelvin Kuo-USA TODAY Sports

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