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.
Novak Djokovic beat Casper Ruud in the French Open final to win a men's record-extending 23rd Grand Slam title.
When the world started looking away, the Swiss ace again brought the spotlight firmly on himself with a masterful showing at the US Open.
Roger Federer suffered a shock 3-6, 7-6(7), 7-6(5) loss to world number 116 Evgeny Donskoy of Russia in the Dubai Open second round on Wednesday.
World number one Rafael Nadal has been drawn alongside defending champion Alexander Zverev, Association of Tennis Professionals (ATP) reported.
The six months off, however, appeared to be positively cathartic as he provided arguably the major talking point of the tennis circuit by reviving a career that pundits thought could be over with the injury.
World number three Roger Federer is playing his first tournament on clay for three years as he prepares for the French Open.
On Friday, the Swiss legend posted a picture of his 'vehicle of choice' for the journey, on his Twitter page.
Federer's charity foundation had been working in Malawi since 2011 and has already opened 80 pre-schools across the country.
Swiss tennis maestro Roger Federer poked fun at Andy Murray after scribbling his own signature next to the Briton's face in spot No 2 at an official ATP event in Monte Carlo.
Images from the Wimbledon semi-final played between Roger Federer and Rafael Nadal on Friday
Tsitsipas will play 22nd-seeded Spaniard Roberto Bautista Agut for a place in the semi-finals.
Sinner remains the man to beat at Melbourne Park even as doping officials seek a two-year ban for the world number one for failing two drugs tests last March.
Nadal, Roger get in the groove for the Big W
Roger Federer said he has never faced problems in switching from claycourts to grass and hopes his decision to play on his least favourite surface at Roland Garros will prove beneficial to his Wimbledon bid.
Wimbledon finalists Novak Djokovic and Roger Federer are on a semi-final collision course at the US Open after they were placed in the same half of the draw.
The two great rivals meet at Roland Garros for the first time in eight years in Friday's tie.
Roger Federer has made no secret that at this stage of his career, anything he does or does not do on a tennis court is done with the sole purpose of making sure he is in the best shape possible to make another title run at Wimbledon.
Alexander Zverev won the first set 7-6, but Novak Djokovic has been forced to withdraw from the match due to injury from the Australian Open semi-final on Friday.
The duo hailed each other in the post-match interview before the tennis titans captured the iconic moment in what Hopman Cup on Twitter described as the 'greatest selfie of all time'.
Roger Federer has revealed he underwent knee surgery and will be out of action until the summer.
Federer cannot fathom how his perfect tennis can be defeated again and again by the fury of Nadal. That's why he was crying. And it hurts Nadal. But he will carry on beating him because he cannot help himself.
Roger Federer claimed an eighth Swiss Indoor title when he outlasted Argentina's Juan Martin del Potro 6-7(5), 6-4, 6-3 in front of a partisan Basel crowd on Sunday.
Wimbledon was scrapped for the first time since World War Two on Wednesday due to the coronavirus pandemic, with the suspension of professional tennis extended to July 13. The 38-year-old Federer is well insulated from the shutdown's financial fallout it could well impact his hopes of adding to his record haul of 20 Grand Slam titles.
Roger Federer won five consecutive US Open titles from 2004-2008 but has not enjoyed much success here recently.
Switzerland's Roger Federer claimed a record-equalling sixth Australian Open title with a 6-2, 6-7(5), 6-3, 3-6, 6-1 victory over Croatia's Marin Cilic on Sunday.
Carlos Alcaraz kept his Indian Wells 'three-peat' campaign on track with a straight sets win against Canadian Denis Shapovalov in the third round.
Djokovic saved three breakpoints in stifling conditions to go 5-4 up but lost the opening set in a tough tiebreak as Opelka cranked up his serve
'Here's how mine went: Lost my last singles, Lost my last doubles, Lost my last team event, Lost my voice during the week, Lost my job'.
Djokovic etched his name in history by clinching a record 24 Grand Slam titles
Roger Federer will make his return to the tennis circuit from a double knee surgery at an ATP 250 tournament in Qatar in March, having not played since last year's Australian Open.
Roger Federer got back on track at the ATP Finals with a 7-6(2), 6-3 defeat of Italian Matteo Berrettini on Tuesday.
The 20-time Grand Slam champion smoothly pressed the accelerator to take the tiebreak and outclassed Cilic in the fourth set to claim a 6-2, 2-6, 7-6 (4), 6-2 win.
Federer had his first hit on Thursday at the ATP 500 event at the German city of Halle, where he has won 10 titles.
Roger Federer said his recovery from two surgeries on his left knee earlier this year has taken longer than expected and he is unsure whether he will be ready for the Australian Open.
Millman advanced to a quarter-final match-up against sixth seed Novak Djokovic.
Friday's showdown will be the 40th meeting between the duo with Rafael Nadal leading 24-15 and 10-3 in Grand Slams.
Former champion Roger Federer withdrew from the French Open on Thursday, citing fitness issues. The 34-year-old world number three missed the recent Madrid Open with back problems and suffered an early defeat at the Italian Open. "I am still not 100% and feel I might be taking an unnecessary risk by playing in this event before I am really ready," the 17-times grand slam champion said on a statement issued on his Facebook account.
Canadian Milos Raonic recovered to upset seven-times champion Roger Federer 6-3 6-7(3) 4-6 7-5 6-3 at Wimbledon to reach his first grand slam final on Friday. The sixth seed will meet the winner of the second semi-final between Britain's 2013 champion Andy Murray and Czech 10th seed Tomas Berdych, runner-up in 2010, in Sunday's showpiece match.