The unexpected turn of events in the quarterfinal of the Montreal Masters continued a remarkable run of success for the host nation. Pospisil, ranked 71st in the world, now awaits the winner of a quarter-final clash between 11th-seeded compatriot Milos Raonic or Latvian Ernests Gulbis, who toppled Wimbledon champion Andy Murray.
In other quarterfinals, top seeded and three-time Canadian champion Novak Djokovic takes on France’s Richard Gasquet and Spain’s fourth-seeded Rafael Nadal faces Australian qualifier Marinko Matosevic.
Pospisil won a title on the low-level Challenger circuit last weekend in Vancouver, but has never been this far at an elite event.
He had reached the quarters with his first victory over a top-10 player, beating Tomas Berdych on Thursday.
He played a semifinal last month on clay in Bogota at a smaller ATP Tour event.