Germany's Tommy Haas beat third seed Nikolay Davydenko 6-3, 2-6, 1-6, 6-1, 7-5 to enter the semi-final.
Serena Williams battled her way into the Australian Open semi-finals with a 3-6, 6-2, 8-6 win over Israeli Shahar Peer.
Marcos Baghdatis failed to repeat his heroics of last year and was beaten by Frenchman Gael Monfils in the second round of the Australian Open.
Garbine Muguruza stormed back into the Grand Slam big time with a 7-5, 6-3 win over Russian Anastasia Pavlyuchenkova to reach her first Australian Open semi-final. Fourth seed Simona Halep advanced to her second Australian Open semi-final with a 6-1, 6-1 demolition of Estonia's Anett Kontaveit in just 53 minutes on Rod Laver Arena.
Former French Open champion Ana Ivanovic was shaken up when a spectator was injured falling down the stairs on Rod Laver Arena but recovered her composure to ease into the third round at the Australian Open on Thursday.
Twelfth seed Patty Schnyder of Switzerland fought back to upset sixth seed Elena Dementieva 6-7, 7-6, 6-2 to reach the quarter-finals.
Andy Roddick and Guillermo Coria raced into the fourth round with crushing victories.
The Wimbledon champion crushed China's Li Na 6-0, 6-2 to become the fifth Russian woman to reach the fourth round.
The Australian team of Wayne Arthurs and Todd Woodbridge teamed up to beat Alex Corretja and Feliciano Lopez in the crucial doubles rubber.
Images from Day 4 of the Australian Open in Melbourne on Thursday
The top seed began her Australian Open quest with a pulverising 6-0, 6-0 win over 15-year-old Olivia Lukaszewicz on Monday.
Images from Saturday's action at the Australian Open.
Images from all the action on Day 4 of the Australian Open in Melbourne on Thursday
Germany's Angelique Kerber breezed past American Madison Keys in straight sets to enter the Australian Open semi-finals in Melbourne on Wednesday. The 2016 champion easily won 6-1, 6-2 in just 51 minutes.
Djokovic, who has ruled like no other on Rod Laver Arena simply had no answer as Chung, nine years his junior, wore him into the ground to win.
Images from the matches played on Day eight of the 2018 Australian Open at Melbourne Park on Monday
Roger Federer overcame some feisty resistance from Alexandr Dolgopolov to safely advance to the third round of the Australian Open with a 6-3, 7-5, 6-1 victory.
Tsitsipas will play 22nd-seeded Spaniard Roberto Bautista Agut for a place in the semi-finals.
IMAGES from the Australian Open matches played on Thursday
The five-day lockdown, ordered after a new COVID-19 outbreak at a hotel, was due to start at midnight.
Daniil Medvedev will play Rafael Nadal for the Australian Open title on Sunday after a stirring victory over Greek fourth seed Stefanos Tsitsipas in the semi-final on Friday.
Organisers hope the anxious buildup will be forgotten when the action begins.
Daniil Medvedev fired Russia into the final of the ATP Cup on Saturday with a tense 3-6, 6-3, 7-5 win over an injury-hampered Alexander Zverev after the German destroyed a racket in frustration over a lost service break.
IMAGES from the Australian Open matches played on Friday.
Rafael Nadal is tied with Roger Federer as the player with the most men's singles majors and the Spaniard can now overtake his great rival who has skipped the Australian Open.
Italy sealed a place in the semi-finals of the ATP Cup by winning both singles matches against France
After six months out of the game, Federer's fairytale return continued under the lights of Rod Laver Arena where he emphatically quashed doubts about his fitness in three hours and 24 minutes of high-octane tennis.
Photos from matches played Day 7 of the Australian Open at Melbourne Park on Sunday
Images from Day 9 of the 2020 Australian Open in Melbourne on Tuesday.
Images from Day 4 of the Australian Open in Melbourne on Thursday.
Bernard Tomic bowed out of the Australian Open on Sunday with a stinging rebuke of the scheduling.
Coco Gauff claimed the biggest win of her young career on Friday with a stunning upset of defending champion Naomi Osaka at the Australian Open to reach the fourth round. Caroline Wozniacki and Serena Williams also lost their respective matches earlier in the day. Images from Day 5 of the Australian Open played at Melbourne Park on Friday.
Images from Sunday's action at the Australian Open.
The Australian Open men's singles final between champion Roger Federer and sixth seed Marin Cilic got underway on Sunday with the roof closed at Rod Laver Arena on a scorching day, triggering a hailstorm of criticism from former players.
Dominic Thiem will watch a treasured home movie of his recent win over Novak Djokovic at the season-ending ATP Tour Finals as he seeks inspiration to take down the defending champion Serb in the Australian Open decider.
Local hope Nick Kyrgios has been elevated to the Rod Laver Arena for his meeting with childhood hero Jo-Wilfried Tsonga at the Australian Open on Friday, when Melbourne Park is again expected to swelter.
Federer called the trainer to the court during the third set against Sandgren and then took a lengthy medical timeout
