On Saturday, the young guns showed no signs of breaking the stranglehold of the three men who collectively own 50 Grand Slam titles and also split the season's first three majors.
This time last year, Federer was the pundits' pick to claim a third Grand Slam title of 2017 in New York, after roaring back from a season decimated by injury to win the Australian Open and Wimbledon.
Images from Day 1 of the US Open in New York, on Monday.
Copil, the World No 93, stunned second seed Alexander Zverev of Germany 6-3, 6-7 (6), 6-4 in the day's other semi-final.
Marin Cilic became the first Croatian to win a Grand Slam singles final in 13 years with his victory at the US Open in New York on Monday.
On the men's side, the fields have already been divided into two ATP 250 tournaments.
Five things to watch out for on day five of the French Open on Thursday
'I don't really like running. I don't like that my shoes get dirty. I don't train too much on clay as it makes my car dirty'
IMAGES from matches on Day 9 at the French Open at Roland Garros
IMAGES from the Australian Open matches played at Melbourne Park on Wednesday
Serena, a six-times champion in New York who is seeded 17th, will start her campaign against Polish world number 60 Magda Linette and could face Venus in the third round before a possible fourth-round showdown with Romanian top seed Halep.
World number one Novak Djokovic received a free pass into the third round of the U.S. Open when Jiri Vesely of the Czech Republic withdrew from their match on Wednesday due to a left forearm injury. The walkover provided the top-seeded defending champion with an extended break to improve his niggling left wrist injury before his next match against either Guido Pella of Argentina or Mikhail Youzhny of Russia.
Somdev Devvarman joined compatriot Ramkumar Ramanathan in the singles main draw of the ATP Chennai Open with a come-from-behind victory over Briton James Ward in the final qualifying round in Chennai on Sunday.
List of US Open men's singles champions since the Open Era began in 1968:
Mercifully the set flashed by in 16 breathtaking minutes as Federer whizzed into the quarter-finals with a 6-0, 7-5, 6-4 win.
Images from Day 9 of the French Open in Paris on Monday.
Rafael Nadal suffered a shock 7-5, 6-3 defeat by Austrian Dominic Thiem in the Madrid Open quarter-finals on Friday, a result that means the Spaniard will lose the world number one ranking.
Britain's Kyle Edmund reached the quarter-finals of a Grand Slam for the first time after coming from a set down to oust Italian Andreas Seppi 6-7(4), 7-5, 6-2, 6-3 in the fourth round of the Australian Open on Sunday.
Roger Federer overcame a sluggish start to defeat Filip Krajinovic 7-5, 6-3 and Kevin Anderson's booming serve proved too much for Joao Sousa as the big names advanced to the fourth round of the Miami Open on Monday.
Rafael Nadal was at his awe-inspiring best as he recovered from a first set wobble to crush Juan Martin del Potro 4-6, 6-0, 6-3, 6-2 in the US Open semi-finals on Friday and move within reach of a 16th grand slam title.
The 32-year-old, who has not played since retiring injured in the US Open semi-finals, cited an abdominal injury.
Twice Shanghai Masters champion Roger Federer was far from his best against Spain's Roberto Bautista Agut but did enough to reach the quarter-finals with a 6-3, 2-6, 6-4 win on Thursday.
Top seed and defending champion Roger Federer battled past in-form Russian Daniil Medvedev 6-4, 4-6, 6-4 to reach the last-16 at the Shanghai Masters on Wednesday.
'He can say what he wants, I don't have a problem with it. Does he show me the same amount of respect that most other players do? No, he doesn't, but that's the way he communicates these days'
Battle-scarred Argentine Juan Martin del Potro clinched his 21st career title with a 6-4, 6-4 win over Kevin Anderson in the Mexican Open final in Acapulco on Sunday.
American Frances Tiafoe celebrated his 21st birthday by stunning Bulgaria's Grigor Dimitrov 7-5, 7-6(6), 6-7(1), 7-5 in the fourth round of the Australian Open on Sunday.
The draw for the first Grand Slam of the season was made on Thursday and the top seeds could face some early tests of their credentials when play gets underway in Melbourne on Monday.
Bulgaria's Grigor Dimitrov edged out South Africa's Kevin Anderson 7-6 (7-1), 3-6, 7-6 (7-5) in a three-hour slugfest to claim his second career title with victory in the Acapulco International final on Sunday.
Andy Murray rallied from a set and a break down against Gilles Simon to advance to his first semi-final since he won last year's Wimbledon title while top seed David Ferrer retired with a thigh strain at the Acapulco International on Thursday.
American qualifier Steve Johnson is through to his first ATP Tour semi-final after an emphatic victory at the Delray Beach Open on Friday.
Gilles Simon's giant-killing spree culminated in a stupendous title win as he humbled second seed Kevin Anderson in straight sets to lift the inaugural Tata Open Maharashtra trophy, in Pune.
'I wake up today and say to myself, 'Today is the day that I'll play'. I need to play with the right energy, and I need to increase the level of my game'
Bernard Tomic bowed out of the Australian Open on Sunday with a stinging rebuke of the scheduling.
Federer, meanwhile, became the first man to lose a Wimbledon singles final after holding match points since 1948 when John Bromwich failed to convert three of them against Bob Falkenburg.
Serbia's Novak Djokovic, who beat Switzerland's Roger Federer to win his 16th Grand Slam title on Sunday:
Top seed and defending champion Roger Federer advanced to the Wimbledon last 16 without dropping a set after a 6-3, 7-5, 6-2 win over German Jan-Lennard Struff on Friday.
IMAGES from Day 7 of the US Open on Sunday
Zverev, who is looking for his fourth tournament win of the year, needed only 64 minutes to defeat Nishikori and move into the final in WashingtonDC where he will play Kevin Anderson after the South African beat Jack Sock by the same score.
At a time when boorish players' behaviour is a cause of concern for cricketing nations, the man earned love, respect, plaudits with his sheer cricketing skills.
Jack Sock started a new tradition on Thursday, one that the 23-year-old hopes will become a regular occurrence as he carves out a successful tennis career.