Serena Williams was sent spinning out of the Western and Southern Open by Maria Sakkari on Tuesday after the Greek rallied from a set down to beat the 23-times Grand Slam champion 5-7, 7-6(5), 6-1 and reach the quarter-finals.
Entering their third Grand Slam final of the year, Leander Paes and Martina Hingis continued their golden run as mixed doubles pair as they beat Bethanie Mattek-Sands and Sam Querrey 6-4, 3-6, 10-7 to win the U.S. Open Mixed Doubles title at the Louis Armstrong stadium on Friday.
Five-times champion Roger Federer reached his first US Open final in six years as he raced past fellow Swiss Stan Wawrinka 6-4, 6-3, 6-1 at Flushing Meadows in the semi-finals on Friday.
Fifth seed Simona Halep narrowly avoided a third-round upset with a 6-1, 2-6, 6-4 win over Hungary's Timea Babos on Saturday to keep her US Open title hopes alive.
Norway's Casper Ruud harnessed his mighty forehand to reach his second Grand Slam final this year by beating Russia's Karen Khachanov 7-6(5), 6-2, 5-7, 6-2 at the US Open, keeping alive his hopes of reaching the top of the world rankings.
The 24-year-old started brightly by taking the first set off the 19th seed on Monday but his lack of match fitness told as, despite frequent treatment from the trainer, he lost the next three to bow out at the first hurdle in a third straight grand slam.
Serena Williams will be wary of another semi-final slip-up when she takes to the Arthur Ashe Stadium court on Thursday to face 10th seed Karolina Pliskova for a spot in the US Open final.
Four years ago Berrettini was playing a Futures event in Italy and on Wednesday became the first Italian man since Corrado Barazzutti 42 years ago to reach the US Open semi-finals.
Chasing a sixth US Open title, Federer needed just one hour and 46 minutes under a closed roof at Arthur Ashe Stadium to put away the 31st seed Lopez, leaving plenty in the tank after being forced to go the distance in his opening two matches.
Dolgopolov, who advanced to the 2nd round of the US Open on Wednesday, said he could not remember ever being approached to fix a match.
Roger Federer launched his bid for an 18th grand slam title with a workmanlike 6-3, 6-4, 7-6 (4) win over Marinko Matosevic to ease into the second round of the US Open on Tuesday, with NBA great Michael Jordan leading the cheering.
A summary of Thursday's action at the US Open.
World number eight Williams, who captured the first of her six US Open titles two years before her 17-year-old opponent was born, spent the first half of the match trying to find her rhythm but when she did she was off to the races.
Spanish teenager Carlos Alcaraz beat Norway's Casper Ruud 6-4, 2-6, 7-6(1), 6-3 in the men's singles final at the US Open on Sunday to win his maiden Grand Slam title and rise to world number one for the first time.
Eugenie Bouchard slumped to a first-round defeat at the US Open on Tuesday but the Canadian might yet leave Flushing Meadows a big winner with her lawsuit against the Grand Slam and United States Tennis Association still to hit the courts.
With Roger Federer and 2018 champion Novak Djokovic having already made exits, Nadal's path to a fourth US Open trophy has been cleared of familiar hurdles.
In the decider, Berrettini broke twice for a 4-2 lead but a rejuvenated Monfils dug deep and raced around the court to fight off three match points to force a final-set tiebreak. But it was Berrettini who leaned on his powerful serve to prevail and become the fourth Italian man to reach a Grand Slam semi-final in the Open Era.
Rediff.com presents the early surprises at the year's final Grand Slam
'He probably deserves a player that is probably more dedicated to the game than I am. He deserves a better athlete than me'
However, the 30-year-old Russia belied her own self-doubt with an impressive three-set win over the Romanian to thrust the former world number one back into the spotlight as the toast of the Big Apple.
Images from the US Open women's semi-finals on Thursday.
Serena Williams signalled she is not quite ready for retirement advancing to the second round of the US Open on Monday with a scrappy 6-3, 6-3 win over Danka Kovinic.
The organisers of the US Open said on Thursday a decision on whether to hold the Grand Slam this year amid the coronavirus outbreak will be made in June, and playing it without fans is on the table but highly unlikely. The US Open, which is scheduled to run from August 31 to September 13, is both the largest and loudest of the four Grand Slam events on the tennis calendar and United States Tennis Association (USTA) chief executive Mike Dowse does not anticipate that changing.
After a flawless first set from Mertens the tide turned in Andreescu's direction in the second when she fired a cross-court forehand winner to break the Belgian at love and take a 4-2 lead.
Prajnesh Gunneswaran got a taste of high-level tennis in his first-round exit from the US Open, losing to world number five Daniil Medvedev in 84 minutes, in New York, on Monday.
Germany's second seeded Angelique Kerber beat Czech Karolina Pliskova 6-3, 4-6, 6-4 to win the US Open final on Saturday, and collect her second Grand Slam title of the year.
The US Open reached an emotional climax on Sunday as the year's final grand slam paused amid heavy security before the start of the men's singles to remember those who died in the 9/11 attacks 15 years ago.
IMAGES from Day 9 of the US Open matches played on Tuesday
Federer has been brandishing an aggressive style of play, forcing the action and rushing in to half-volley weak second serves to forge an advantage.
The final will pit power against power when Andreescu takes on her childhood hero Williams, who claimed her first US Open title in 1999 before Andreescu was even born.
Japan's Kei Nishikori overcame second seed Andy Murray for a gruelling 1-6, 6-4, 4-6, 6-1, 7-5 see-saw victory on Wednesday to reach the US Open semi-finals.
Andy Murray said on Thursday the noise created by the US Open's new retractable roof over Arthur Ashe Stadium is a distraction to players and makes it difficult to react to opponents' shots.
Images from Day 2 at the US Open played at Flushing Meadows in New York on Tuesday
With the American men experiencing their longest US Open title drought in the Open era, Venus Williams led the American charge into round two on Monday with a 6-3, 3-6, 6-2 win over Viktoria Kuzmova of Slovakia.
'I don't know. It's tough to explain my emotion right now. Maybe tomorrow morning I can tell you something, but now it's amazing'
Serena Williams has been vulnerable this Grand Slam season but unbeaten in the year's first three major championships.
With the physical demands of modern-day tennis taking its toll the tournament will start without four of the top 11 in the ATP rankings including defending champion Stan Wawrinka who ended his season early with a knee injury.
Novak Djokovic's bid for a record 25th Grand Slam title kicked off on Monday with an easy win over qualifier Radu Albot in the US Open first round.
IMAGES from Day 10 of the US Open, at the USTA Billie Jean King National Tennis Center, Flushing Meadows, New York.
'It's a tough loss, but it was obviously a great experience' 'I'd love to build on these two weeks'