Federer won the first set but Sandgren rallied to bag the next two against the error-prone Swiss
An angry Tennys Sandgren slammed journalists for "demonising" him with "sensationalist" reporting on his social media links to right-wing activists but said the controversy had not affected him during his Australian Open quarter-final loss to South Korea's Chung Hyeon.
The Australian Open will lose one of its giant killers when South Korean Chung Hyeon meets American Tennys Sandgren in an unlikely quarter-final showdown at the Rod Laver Arena on Wednesday.
'With all the foot issues, just turned 36, he adds his 22nd Major'
The Swiss was handed a code violation for swearing in the third set of Tuesday's match after the lineswoman reported Federer to Serbian chair umpire Marijana Veljovic.
The event includes several safety measures designed to mitigate the potential spread of coronavirus, including COVID-19 testing for participants and regular temperature checks
Top seed Novak Djokovic made quick work of Tennys Sandgren at the Western and Southern Open on Tuesday, never dropping serve en route to a 6-2, 6-4 win over the American, while big-serving Milos Raonic enjoyed a straight sets win over Andy Murray.
'Wish a bomb would explode on this club. A bomb should explode here'.
Defending champion Roger Federer argued with an umpire but mostly let his racket do the talking as he beat Tomas Berdych for the ninth time running to reach the Australian Open semi-finals on Wednesday.
Men's second seed Rafael Nadal starts against Israel's Dudi Sela while three-time champion Novak Djokovic faces American Tennys Sandgren.
Diagnosed as deaf at the age of two, Lee Duck-hee cannot hear calls from the line judges or the umpire and relies on signals and gestures for the information.
The positive cases were recorded after the charter flight from Los Angeles landed in Melbourne for the tennis Grand Slam, according to online posts from players.
Nightmares loom for players dreaming of Grand Slam success if they have the misfortune of running into bespectacled bogeyman Chung Hyeon in coming years, according to his coach Neville Godwin.
Sebastian Korda is just the third American to reach the quarter-finals at the Australian Open.
The 32-year-old pulled out of the doubles event at the US Open to focus on his singles comeback after undergoing career-saving hip resurfacing surgery.
'He's a bit of God, I'm not gonna lie'
Sharapova was granted a wildcard entry to the last Grand Slam of the season but received a tough first-round draw in the shape of Romanian Halep.
Federer called the trainer to the court during the third set against Sandgren and then took a lengthy medical timeout
World number one Novak Djokovic has been "playing by his own rules" and has put his bid for a 21st Grand Slam title at risk by not following Australia's COVID-19 vaccination requirements, world number four Stefanos Tsitsipas said on Thursday.
Fabio Fognini and Salvatore Caruso had to be separated by the court supervisor after the first all-Italian Australian Open men's singles match
Bhambri, ranked 116 in the world, had reached the second round when the ATP 250 event was played in Chennai in January 2017.
Indian players enjoyed a good day on the ATP Challenger tour as Yuki Bhambri reached the singles semifinals of the Traralgon event in Australia while Somdev Devvarman and Saketh Myneni reached the quarter-finals of the Charlottesville event in the United States.
From potential dark horses to former champions, here are the players who were knocked out of the Australian Open on Thursday
Chung is being touted as the next Djokovic because of his relentless defensive skills.
Roger Federer, who suffered a groin problem in the quarter-final against Tennys Sandgren, bowed out of the Australian Open after a comprehensive 7-6(1), 6-4, 6-3 defeat to the defending champion Novak Djokovic.
Yuki Bhambri recovered well from a poor start to beat New Zealand's Michael Venus in a three-setter and advance to the singles quarter-finals of the ATP Challenger event in Traralgon, Australia.
Images from the matches played on Day eight of the 2018 Australian Open at Melbourne Park on Monday
Unlike the United States and European countries, which are battling to contain the virus, Australia has not had a case of community transmission for 11 straight days and residents have regained most of their pre-COVID freedoms.
Images from the action on Day 2 at the Australian Open.
Second seed Novak Djokovic outclassed Roger Federer in straight sets to enter the final of Australian Open in Melbourne on Thursday. Seven-time champion Djokovic started off slowly before he took complete control to register an emphatic 7-6, 6-4, 6-3 victory in the first semi-final.
The traditional handshake at the net quickly degenerated into a heated argument when Fabio Fognini suggested Salvatore Caruso was lucky on some points in the match, an observation the Sicilian objected to.
'Irresponsible' Djokovic panned for Adria Tour misadventure.
Two coronavirus infections were reported on Saturday on a flight to the Australian Open, forcing two weeks of strict hotel quarantine for all the tennis players and entourage on board.
The claycourt Grand Slam at Roland Garros would now take place from Sept. 20-Oct. 4, dates that clash with several other events. With players already counting the cost of the tennis shutdown, the decision did not go down well.
Images from the men's singles fourth round matches at the Australian Open, on Sunday.
Venus Williams and CoCo Vandeweghe won the opening singles matches to give holders the United States a commanding 2-0 lead in their Fed Cup World Group opener against the Netherlands in Asheville, North Carolina on Saturday.
Former world number one Andy Murray won his first ATP tour singles match in nearly nine months with a 6-3, 6-7(6), 6-1 victory over American Tennys Sandgren in the opening round of the Zhuhai Championships.
The world number one had arrived in Tokyo aiming to become the first man to win all four majors and an Olympic gold medal in the same calendar year. But that quest came to an end after he was beaten by fifth-ranked German Alexander Zverev in Friday's semi-final.
Summary of sports events and persons who made news on Monday
Andy Murray claimed the biggest win of his comeback and a place in the last 16 of the Western and Southern Open on Monday by taking out self-destructing fifth seed Alexander Zverev 6-3, 3-6, 7-5.