Australia’s Alexei Popyrin has extended a brilliant run of upset victories all the way to the final of the ATP Tour’s rain-interrupted Montreal Masters.

Playing his second match in one day, world No.62 Popyrin defeated last week’s Washington title winner Sebastian Korda 7-6 (7-0) 6-3 in his semi-final on Sunday night to set up a title decider against Russia’s fifth seed Andrey Rublev.

Hours earlier he won a tight quarter-final battle to oust fourth-seeded world No.6 Hubert Hurkacz 3-6 7-6 (7-5) 7-5.

The 25-year-old Olympian from Sydney had already overcome 11th seed Ben Shelton and seventh seed Grigor Dimitrov in previous rounds at the elite Masters 1000 series event.

Popyrin will be seeking for the third, and biggest, title of his career against Rublev on Monday (Tuesday AEST).

That will be far from easy.

World No.8 Rublev has victories this year in Madrid and Hong Kong among 16 careeer titles and he made relatively quick work of Italy’s Matteo Arnaldi, winning 6-4 6-1 in a rain-interrupted first semi-final earlier in the evening.

The 26-year-old Russian had beaten top-seeded Australian Open champion Jannik Sinner 6-3 1-6 6-2 in their quarter-final on Saturday night.

Rain previously washed out play Thursday night and all of Friday as remnants of Tropical Storm Debby rolled through, putting the event behind schedule.