Temperatures at the Australian Open have been well above 100 degrees Farenheit during some matches.
Two-time Wimbledon champion Petra Kvitova lost 6-3, 4-6, 10-8 to Andrea Petkovic. I tried to cool down. "To go one more further".
Chung showed another sign of his promise by coolly closing out a five-set win over German fourth seed Alexander Zverev, a player many pundits have widely tipped as a future grand slam victor.
"He (Chung) is playing great".
He played two rounds in Melbourne with a re-modelled serving action to take the pressure off the joint, but the 30-year-old has still managed his way through wearing a compression sleeve on his serving arm.
The Frenchman rated the conditions the toughest he has ever played in, saying: "For sure, we took a risk". I was just hanging in there to keep every chance to progress. "The fourth could have gone either way".
He has beaten the Spaniard in all five career meetings, including in straight sets in the fourth round at the French Open previous year.
"Nothing major", Djokovic told reporters after setting up an intriguing inter-generational battle with South Korea's young gun Chung Hyeon, 21, for a place in the quarter-finals. Last year, the 20-year-old German who is predicted to be a Grand Slam victor lost to eventual runner-up Rafael Nadal in five sets.
Djokovic hit four double faults in the first three games but fought back to 3-3 as both players made errors from the back of the court. He maintained his flawless record against Mannarino, beating the Frenchman for the seventh consecutive time.
Naomi Osaka reacts during her third round match against Ashleigh Barty.
Alexander Zverev of Germany throws his racket in frustration. He lost both five-setters that he played past year at the majors to Tomas Berdych at Wimbledon and to Juan Martin del Potro at the US Open.
Maria Sharapova was untroubled by the heat, although she was on court in the morning and avoided the worst of it. Heat, humidity, and wind all can play a large factor in the outcome of any match.
Madison Keys reacts during her third round match against Ana Bogdan.
Top-seeded Simona Halep served for the match four times before prevailing 4-6, 6-4, 15-13 over American Lauren Davis in a marathon match at Rod Laver Arena.
It took Fabio Fognini almost eight years, but he's finally avenged a fourth-round loss to Julien Benneteau at Wimbledon.
The Frenchman spent much of the third set crouching on his haunches, and at times it wasn't clear if he'd continue.
Djokovic returned after being treated but looked hampered by the issue and was noticeably grabbing at his hip, and limping after most points - particularly when forced to run by his Spanish opponent.
He will play either Argentine 12th seed Juan Martin Del Potro or Czech 19th seed Tomas Berdych in Monday's fourth round. The 14th-seeded Sevastova, a master of finesse, was tricky enough to eliminate Sharapova on her way to the US Open quarterfinals a year ago.