Roger Federer stunned by Russian qualifier Andrey Rublev in Cincinnati

For Roger Federer, it was one big blur. The seven-time champion was ousted from one of his favourite tournaments in barely over an hour, falling in straight sets to a 21-year-old qualifier he’d never faced.

Andre Rublev — with only one career win over a top-five player to his credit — took advantages of Federer’s numerous mistakes for a 6-3, 6-4 victory Thursday that further depleted the top of the men’s bracket in the Western & Southern Open.

“The biggest and the most emotional win,” Rublev called it.

And shockingly fast, too: Federer’s quickest defeat on the tour since 2003.