By Daniel Chavkin Stanford will try to ride its Wednesday momentum vs. Arizona to begin Thursday’s slate. View the original article to see embedded media. After an exciting beginning to championship week, the Pac-12 Tournament continues with the quarterfinals from Las Vegas on Thursday. The fist game of the tournament was also the most exciting, as No. 9 Stanford erased a 17-point deficit in the second half and defeated No. 8 Arizona State on a last second buzzer beater, 71-70. The other three Wednesday games weren’t as dramatic. No. 5 Oregon took down No. 12 Oregon State 86-72, No 7 Washingto…