Vasek also advances to round 3, although he's being plagued by lingering back issues. He faces Stan Wawrinka next, which is going to be a tough match.
The Canadian took treatment three times in the second set and at times looked finished, but the 23-year-old fought on and managed to earn the improbable victory.
The back pain has bothered him since the start of the year, forcing him to quit a semifinal in India and pull out of a tournament in Sydney.
“It’s been lingering, I had to hang tough. I’m super-thrilled to get through,” said Pospisil, who depended on painkillers to get him to the finish after being told by a physiotherapist that he could go on if he wished.
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