Aussie teen Alex De Minaur has made a brilliant admission about how he managed to shock former World No.3 Milos Raonic.
The 18-year-old wildcard muzzled the Canadian's powerful service game to prevail 6-4 6-4 on Wednesday night and score by far the biggest win of his burgeoning career.
Raonic, the 2016 champion in Brisbane, was shellshocked by De Minaur's ability to consistently return his booming serve.
De Minaur's returning was so strong that Roger Rasheed believed the young Aussie must have been reading Raonic's serve and knew where it was going.
However De Minaur was asked about that theory after the match, and his response was gold.
"I was just guessing really, not going to lie" he said, sparking laughter from the Pat Rafter Arena crowd.
He did admit that he switched up his approach in a bid to disrupt Raonic's rhythm on serve.
"I tried to change my returning position a bit to throw him off," he said.
"He didn't have his greatest serving day and I took advantage of it."
Raonic was clearly rusty in his first singles match since October last year, making 18 costly unforced errors to just one.
De Minaur capitalised handsomely to set up a clash with another teenager, Saudi Arabian-born American qualifier Michael Mmoh, who upset Germany's Mischa Zverev earlier on Wednesday.
It will be his first ATP quarter-final appearance.