Alex De Minaur
Image credit: Reuters
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It took him the best part of four hours to get the win - and an imminent third-round match with world number two Rafael Nadal.
De Minaur had a match point in the third set which he failed to convert, allowing the Swiss to take the tie-break.
"That was definitely pretty special," said the teenager afterwards, and added to the crowd: "You guys got me through that - I can't thank you guys enough."