Rafael Nadal gave Russian teenager Andrey Rublev a tennis lesson on Wednesday, racing into the semi-finals of the US Open with a ruthless 6-1, 6-2, 6-2 win that cleared the path for a possible showdown with rival Roger Federer.
German Kerber has not won a title since and will now drop out of the world's top 10.
Serena's coach said it had been a winding road following the birth of her daughter in 2017 to the kind of peak performance that brought her US Open success in the past.
'I definitely think it's the time to just switch off from any future thoughts or any plans, any schedule. I've got absolutely no clue. Right now, no care in the world, I'm just loving life.'
IMAGES from Day 9 of the US Open matches played on Tuesday
Fourth seed Rafael Nadal showed he is healthy and ready to challenge for a third US Open title as he rolled into the last 16 at Flushing Meadows on Friday with a fist-pumping 6-1, 6-4, 6-2 win over Russian Andrey Kuznetsov.
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.
A summary of the second day's play at the US Open.
Bumrah (6/16) rattled the West Indies by picking up the first five wickets, three of which came in successive balls in the ninth over.
Barty survived a first-round scare at the US Open on Monday
Big-serving Canadian Milos Raonic fired 19 aces to topple Sam Querrey 6-4, 6-4 and set up a second-round clash with either Dan Evans or Russian 10th seed Andrey Rublev.
After a mature performance against ninth seed David Goffin, the 19-year-old set up an intriguing last-eight showdown with world number one Rafael Nadal.
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.
The Swiss snapped a five-year barren run at the slams by bagging the Australian Open and Wimbledon titles this year and, in the absence of Novak Djokovic, Andy Murray and Stan Wawrinka, is the favourite at Flushing Meadows with an equally resurgent Rafael Nadal.
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.
When Juan Martin del Potro takes the court on Sunday in the US Open men's final against Serbia's Novak Djokovic he will look to not only end a nine-year Grand Slam title drought but also extend a comeback from when he almost quit professional tennis three years ago.
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.
Roger Federer glided to victory on another hot, steamy day at the US Open, the envy of a clutch of men's players made to work overtime on Tuesday at the season's final Grand Slam.
Photos from the US Open matches played on Monday
Martina Navratilova recently proposed to her longtime girlfriend Julia Lemigova at U.S. Open tennis championship.
A summary of Wednesday's action at the US Open.
Leylah Fernandez's storybook US Open continued with yet another upset on Thursday, as the Canadian teenager shocked second seed Aryna Sabalenka 7-6(3), 4-6, 6-4 to reach her first Grand Slam final.
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.
'It's always going to be ... in the years to come, 'oh, you know that guy won a US Open in 2020 without fans'. I don't think it's going to have that weight... It wouldn't be the best scenario.'
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.
Twice Australian Open champion Victoria Azarenka overcame an inspired challenge from qualifier Aleksandra Krunic of Serbia 4-6, 6-4, 6-4 on Monday to advance to the quarter-finals of the US Open.
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.
A pioneering Kei Nishikori blazed a new trail for Japanese tennis with a shock win over World No 1 Novak Djokovic at the U.S. Open on Saturday, becoming the first man from Asia to book a place in a Grand Slam final.
Daniil Medvedev dominated Canada's Felix Auger-Aliassime 6-4, 7-5, 6-2 on Friday to reach the US Open final courtesy of a dozen aces in just a little over two hours.
'I know earlier in the tournament I said something in kind of a bad way and now I'm saying it in a good way: That it's because of your energy that I'm in the final'
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.
'I really like the way he plays, mixes in the slice, the dropshot, volleys really well. There's so many things I like from his game. Hopefully I can keep working on those and become just like him'
Top-seeded world number ones Serena Williams and Novak Djokovic help launch the US Open tennis championships on Monday's opening day of the year's final Grand Slam.
Masks were required and high-fives banned, with signs reminding those in attendance to maintain proper social distancing.
World number one Novak Djokovic and number two Rafa Nadal set up a mouth-watering men's singles final at the US Open with victories in the semi-finals at Flushing Meadows on Saturday.
Dominic Thiem will take on Germany's Alexander Zverev in Sunday's US Open final.
Rafael Nadal captured his 16th career Grand Slam title and third at the US Open