Chung Hyeon produced the performance of the day at the Australian Open on Monday to knock out six-time champion Novak Djokovic, who struggled with pain in his troublesome right elbow.
Chung will face an even more unlikely quarter-finalist next in American Tennys Sandgren, who had never won a grand slam match before arriving in Melbourne but knocked out fifth seed Dominic Thiem over five sets.
Angelique Kerber eventually got the better of the remarkable Hsieh Su-wei and next faces in-form Madison Keys while world number one Simona Halep was a comfortable winner against Naomi Osaka.
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“I had to pick shoes, either non-marking or marking shoes,” he said. “The marking shoes were Spider-Man shoes. I’m like, ‘well, I want the Spider-Man shoes’. But I also didn’t want to mark the court, I wanted to be able to play. I chose the generic, non-marking shoes. It was kind of one of those moments where you choose your path.”
After his victory over Djokovic, Chung was rather surprised to be asked his thoughts on a joint North and South Korean team at the Winter Olympics. “I think it’s a good question, but I don’t know. I’m just playing tennis, so I can’t say anything about this,” he said before the subject was quickly shut down.
The British number two will see his ranking soar into the top 30 if he can defeat the Bulgarian, while the other men’s clash pits world number one Rafael Nadal against sixth seed Marin Cilic.
Second seed Caroline Wozniacki faces Carla Suarez Navarro as she bids to reach her first semi-final since 2011 in Melbourne. Fourth seed Elina Svitolina is yet to make the last four at any slam and she takes on in-form Belgian Elise Mertens.