Federer looked more relieved than overjoyed when Tiafoe's forehand found the net on match point to keep his hopes of a 20th grand slam title alive.
Federer had skipped the clay court season the past two years since last competing in Rome in May 2016 but confirmed his participation for the tournament in Madrid earlier this year.
On the 10th anniversary of the 2008 Wimbledon men's final that is widely considered the 'greatest ever tennis match' it seems like the stars may be aligning for Roger Federer and Rafael Nadal to meet in another mesmerising epic.
The video has already garnered over 3.85 million views and shows Federer hitting between-the-legs "tweeners" and behind-the-back shots.
'It was exciting and this is why I came to New York, to go through these emotions'
World No 2 Federer became the first player to book his place in the semi-finals of the season-ending ATP World Tour Finals by seeing off a spirited challenge from 20-year-old Alexander Zverev of Germany 7-6 (8-6), 5-7, 6-1 in a thrilling round robin clash that lasted two hours and 11 minutes on Tuesday.
Nadal thrashes Nishikori; Federer downs Wawrinka
Defending champion Roger Federer's remarkable run of reaching 36 consecutive Grand Slam quarter-finals or better was ended in a shock second-round Wimbledon defeat by unheralded Ukrainian Sergiy Stakhovsky on Wednesday.
Roger Federer eased his way into the ATP World Tour Finals with a 6-1, 7-6 (0) defeat of Canadian newcomer Milos Raonic in his opening round-robin match on Sunday.
Top seed Roger Federer was beaten 6-4, 7-6 by American James Blake in the quarter-finals of the Olympic men's singles on Thursday.
Nick Kyrgios ended Novak Djokovic's 19-match winning run at Indian Wells by beating the Serb 6-4, 7-6(3) to reach the BNP Paribas Open quarter-finals in Indian Wells on Wednesday, while Roger Federer also advanced with a straight sets win over Rafael Nadal.
Roger Federer will not warm up for the Australian Open at this week's Kooyong Classic in Melbourne, prompting organisers to target Briton Andy Murray for the vacant eighth spot in the invitational field.
Roger Federer produced a vintage performance to crush Richard Gasquet 6-4, 6-2, 6-2 and seal Switzerland's maiden Davis Cup title with a 3-1 win over hosts France on Sunday.
Sticking to a limited schedule has helped Roger Federer enjoy a renaissance late in his career but the Swiss says rest time is now over and he is looking forward to returning to action at the Mercedes Cup in Stuttgart.
Roger Federer is looking forward to facing his great rival for the French Open crown a year after Rafael Nadal missed their rendezvous in the final. With usual contenders Nikolay Davydenko of Russia and Argentine Juan Martin Del Potro having pulled out injured, the road looks clearer for another Roger versus Rafa classic.
Roger Federer avenged his loss to Jo-Wilfried Tsonga at Wimbledon this year when he beat the Frenchman 6-4, 6-3, 6-3 on Thursday to reach the semi-finals of the US Open and give himself a chance of a sixth title at Flushing Meadows.
An emotional Roger Federer wiped away tears and urged Rafael Nadal to stay with him on the tour for years to come after felling his great rival to win his fifth Australian Open on Sunday.
Roger Federer returned to Wimbledon on Sunday to take part in All England Club's special celebration of 100 years of Centre Court.
Federer displayed his trademark silky movement and said the knee had held up during a two-hour 24 minute duel.
The two standout performers will meet after 21-year-old Greek debutant Tsitsipas eclipsed six-times champion Roger Federer 6-3, 6-4 and Austrian Thiem dispatched defending champion Alexander Zverev 7-5, 6-3.
Roger Federer claimed one of the few titles to have previously eluded him after he overcame a sluggish start to beat injured Frenchman Gilles Simon in the Shanghai Masters final on Sunday.
'He is defying all the logic and that is something that I totally love.' 'I hate following the norm, and he is someone that is breaking all those barriers on a daily basis so I have a huge respect for him.'
Daniil Medvedev said he was enjoying his growing rivalry with world number one Jannik Sinner despite coming out on the wrong end of the scoreline
There could be no place more appropriate for Djokovic to finally break free of his tie with Margaret Court on 24 Grand Slam singles titles than in her own backyard at Melbourne Park, where he has won the Norman Brookes Challenge Cup 10 times.
The man who always seems to be relaxed, the man who is so alive, yet so deceptively cold. The man who does not know how to panic.
Carlos Alcaraz kept his Indian Wells 'three-peat' campaign on track with a straight sets win against Canadian Denis Shapovalov in the third round.
Roger Federer advanced to the final of the Australian Open with a 6-2, 7-5, 7-5 demolition of Andy Roddick on Thursday. Federer, who beat the American at the same stage in the 2007 tournament before going on to lift the title, will play either world number one Rafa Nadal or Fernando Verdasco in the final.
Roger Federer is optimistic his back is on the mend as he prepares to return to action in the Wimbledon warm-up event on Stuttgart's grass courts this week.
Federer delivered in a tight 4-6 7-6(6) 11-9 win over world number 20 Nick Kyrgios, with the Australian pushing to the final point as he sought a win that would have forced an overtime doubles match to decide the tournament.
Rafael Nadal, who lost all four of his previous Miami Open finals, will be out to snap a run of three straight defeats against Roger Federer.
The princess, who is the wife of heir-to-the-throne Prince William, made her return to public duties in June at "Trooping the Colour", the annual military parade to mark the official birthday of King Charles, and said she hoped to attend other events over the summer.
There was no rain break, no twilight five-set drama and no Wimbledon trophy on offer on Friday but none of that bothered ageless Swiss maestro Roger Federer. The only thing that mattered to the 20-time Grand Slam champion was that, unlike in his last grasscourt duel with Rafael Nadal 11 years ago, he had won the "crazy last game" which sealed his passage into a 12th Wimbledon final.
The 36-year-old Swiss will play Canada's Milos Raonic in Sunday's final.
Roger Federer has been the planet's number one tennis player for 160 weeks, which means he now holds the record of being No 1 for the longest time in tennis history.
The beaten Wimbledon finalist has now lost six of his seven meetings with Federer, the world number one.. \n\n
The 17-times Grand Slam champion said he found some of the rules "strange" and others unnecessary.
Australia's Lleyton Hewitt delighted his home fans when he battled to a typically gutsy 6-1, 4-6, 6-3 victory over Swiss top seed Roger Federer in the Brisbane International final on Sunday.
Lavishing praise on Federer, Woods said that the tennis star has truly proved himself by winning a Grand Slam title at this age.
A look at the 10 landmark matches from the 20-times Grand Slam champion's career.
Nadal may have 19 Grand Slam titles, one shy of Federer's all-time men's record, but when it comes to IT skills, he resembled a Sunday morning park hacker crumbling under pressure. After some pleasantries, the conversation moved on to the forthcoming virtual Madrid Open being contested with joysticks rather than tennis rackets.