India's Rohan Bopanna and his Pakistani partner Aisam Qureshi crashed out of the US Open after going down fighting in the men's doubles first round contest at the Flushing Meadows in New York.
Naomi Osaka trying to move on from 'bittersweet' maiden Grand Slam title
Key facts and records of American Serena Williams and Canada's Bianca Andreescu
'I think when I first started, you could win a lot of easy matches, then you're in the quarter-finals, that's when it starts to get a little more tough. Now, like, there's no easy match. Everyone's playing great. Everyone's just doing a lot better'
While Monfils's and Svitolina's relationship has blossomed, so have their respective games.
Djokovic struggled with both his serve and backhand during a 6-4, 7-6(3), 6-1 win over Argentine Juan Ignacio Londero and later said his left shoulder had been bothering him for weeks with the pain getting worse during the match.
Monday was also the first time in more than two decades that India had more than one player in the main draw of a Grand Slam singles, with Prajnesh Gunneswaran losing to world number five Daniil Medvedev in an earlier match.
Rafael Nadal ended a sub-par Grand Slam season on a heartbreaking note when he fell 3-6, 4-6, 6-4 6-3, 6-4 at the US Open to an inspired Fabio Fognini after winning the first two sets at Flushing Meadows in New York, on Friday.
Men's champion Stan Wawrinka avenged a tough defeat to Kei Nishikori at last year's US Open at the Australian Open on Wednesday.
Karolina Pliskova showed the steel of a world number one as she fought off a match point to claim a riveting 3-6, 7-5, 6-4 comeback win over Zhang Shuai in the US Open third round.
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.
IMAGES from Day 8 of the US Open on Monday
Novak Djokovic and Rogerer Federer loom over Melbourne Park for the year's opening Grand Slam as favourites for the Australian Open as questions remain as to whether one of Generation Next could finally end their stranglehold.
The volatile 17th seed had a quiet evening by his standards in his opening match on Monday, with just the one violation for unsportsmanlike behaviour when he asked spectator, in no uncertain terms, to be quiet while he was serving.
The top seeded pair beat the unseeded combination of Abigail Spears of the United States and Mexico's Santiago Gonzalez 6-1, 2-6, 11-9 in a thrilling mixed doubles final.
Images from Day 2 of the 2020 US Open in New York
Stan Wawrinka, who captured his maiden US Open title and first grand slam trophy of the year after defeating world number one Novak Djokovic, is unable to contain his excitement.
'Tired' Kei Nishikori takes positives out of Open despite loss.
Masks were required and high-fives banned, with signs reminding those in attendance to maintain proper social distancing.
Man of many faces, Medvedev now a Grand Slam finalist
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.
"For me, right now I have this feeling of sadness," said Osaka.
As the fans head toward Flushing Meadows, tennis stars gear up with ground-breaking styles to rule the courts.
'I don't mind when he misbehaves. Obviously, I don't like the bad language. It's just when he doesn't try to play tennis, when he doesn't try to win then I think the umpire needs to step in. I think in this situation, default him on the spot, rather than suspend him'
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.
World number two Roger Federer launches his bid for a sixth US Open title, and his first since 2008, with a first-round match against Argentina's Leonardo Mayer at the Arthur Ashe Stadium on Tuesday.
Maria Sharapova's US Open preparations took a major blow with the Russian World No 2 forced to withdraw from next week's WTA event in Toronto.
Marin Cilic and Kei Nishikori will meet in the semi-finals at the Citi Open in Washington on Saturday, their first encounter since the final of last year's US Open.
World number one Naomi Osaka will "probably" defend her US Open title, even if it means defying her doctor's orders.
Images from the third day at the US Open, the final Grand Slam tournament of the year, in New York, on Wednesday:
Both players burn with heaps of motivation to hoist the winner's trophy at Arthur Ashe Stadium in the last grand moment of the 2015 slam season.
Defending US Open champion Rafael Nadal and twice winner Novak Djokovic are one victory away from renewing their rivalry in the final with both expected to get through their semis on Friday.
Asked if she could have all her titles and Venus all hers without having ever had to play each other, Serena said she would happily accept that deal.
Serena Williams squandered four match points and blew a 5-1 lead in the decider to fall to seventh seed Karolina Pliskova 6-4 4-6 7-5 in the quarter-finals of the Australian Open.
Konta first British woman in US Open last 16 since 1991
The Scotsman doesn't expect to win US Open this year
Novak Djokovic finally clinched the title missing from his resume with a 6-4, 6-4 win over Roger Federer on Sunday to win in Cincinnati and become the first player to complete the sweep of Masters series tournaments on Sunday.
Sloane Stephens's US Open win could be the first of many Grand Slam titles for the young American, but there is a question mark on her ambitions, according to former world number one Mats Wilander.
The German sixth seed, who has not won a title since winning at Flushing Meadows last year, never got into the match against the 2016 WTA newcomer of the year.
Indian tennis ace Sania Mirza and her Zimbabwean partner Cara Black hardly broke a sweat as they entered the US Open women's doubles semifinals after their rivals retired midway through the quarterfinal match in New York.