No. 5 Stanford (9-2-4, 3-2-3 Pac-12) fell 21 to Oregon State (6-3-4, 2-1-3 Pac-12) in a cold Thursday night game. With No. 1 Washington (13-0-2, 5-0-1 Pac-12) looming on the weekend, the Cardinal weren’t able to convert their chances, faltering at an unfortunate time before their biggest match of the season. Stanford came into the game red-hot, having won their last three games with two clean…