The loss by Cink left no Americans in the Saturday afternoon semis for the first time in the tournament’s 12-year history.
It was Casey’s fourth 5 and 4 win in four rounds. The English-born golfer, who attended Arizona State University and lives in Scottsdale, has yet to play the final four holes in the event.
Casey faces Colombian Camilo Villegas, a 4 and 3 winner over South African Retief Goosen. In the other quarterfinals, Spain’s Sergio Garcia beat Oliver Wilson 4 and 3 and Englishman Ian Poulter edged Tongchai Jaidee of Thailand 1-up.