Venus Williams also went the distance before claiming a 2-6, 6-3, 6-3 victory over Croatia's Donna Vekic.
Williams sisters Serena and Venus had been hoping to provide fans with the first all-Williams sisters clash at a Grand Slam since the 2009 Wimbledon final in the semi-finals.
Multiple Grand Slam champions Serena and Venus Williams withdrew from women's doubles competition at the Australian Open on Wednesday before first round action got underway.
To the clear delight of the fans, however, Djokovic then bounded onto the court after his practice partner had won the first set and proceeded to wrap up a 6-3, 6-3 win over the Italian teenager.
Novak Djokovic eased into the last four with a commanding performance over Japan's Kei Nishikori but world number two Daniil Medvedev bowed out of the men's singles at the Tokyo Olympics.
Images from the US Open matches played at Flushing Meadows on Thursday.
The closest ever images of the sun reveal its surface is speckled with "campfires", miniature versions of the dramatic solar flares visible from Earth.
Here is a Factbox on Spaniard Garbine Muguruza, who beat American Venus Williams 7-5, 6-0 to win her first Wimbledon singles title on Saturday:
Sixteen-year-old Coco Gauff said her game is the "best it's ever been," as she aims to build on her Grand Slam success as the US Open kicks off on Monday.
'Take care of yourself and see you back winning soon!'
Dil Bekaraar is watchable, but not quick-witted enough to binge watch, feels Sukanya Verma.
Sania Mirza and Rohan Bopanna sqaundered a set advantage to lose to USA's Venus Williams and Rajiv Ram 6-2, 2-6, 3-10 in the Rio Olympics semi-finals on Saturday.
US won 4-1 against Argentina in the Fed Cup World Group II tie.
Leander Paes' hopes of creating a world record in Davis Cup were dashed when the veteran Indian and Vishnu Vardhan lost the third rubber to strong rivals Artem Sitak and Michael Venus, who kept the New Zealand alive in the Asia-Oceania Group I Davis Cup tie.
Sisters Serena and Venus Williams marched into the quarter-finals of the Miami Open after straight-set wins at Key Biscayne on Monday.
Here is a list of US Open women's singles champions since the open era began in 1968:
Germany's Angelique Kerber said she felt confident about facing Serena Williams in Saturday's Wimbledon final after beating the world number one in Australia earlier this year, and warned: I'm even more dangerous on grass. The fourth seed gatecrashed the Williams sisters' Wimbledon party when she overpowered Venus 6-4 6-4 in the semi-finals on Thursday, setting up the clash with Serena.
Venus Williams rolled back the years to beat Belgium's Kirsten Flipkens in the first round of the U.S. Open on Monday as the final Grand Slam of the year burst into life.
Naomi Osaka faces Zheng before possible meeting with Coco Gauff
With no standout favourite in the women's field, it could provide an ideal stage for American Serena Williams to finally end her quest for an elusive 24th Grand Slam title.
Isro will rope in industry to manufacture customised Isro-theme T-shirts, coffee mugs, posters, key chains, games, jigsaw puzzle and so on.
Serena Williams has won 21 Grand Slam titles but failed to finish 5km run in Miami, Florida.
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.
Minneapolis police officer Derek Chauvin was charged on Friday with murder in the death of 46-year-old George Floyd after cellphone footage of the white officer kneeling on Floyd's neck prompted a wave of protests.
Ash Barty's bid to end the host nation's long wait for a homegrown Australian Open champion will begin against Ukraine's Lesia Tsurenko
'It's so amazing that she doesn't look a day older than 25.'
Following her US Open quarter-final win over elder sister Venus, the 21-year-old tennis player said that she did not want to answer any media queries, according to E! Online.
Time is running out for Serena to reach the career milestone that has become one of the sport's longest running storylines.
Images from Day 3 of the Australian Open in Melbourne on Wednesday.
Amitabh Bachchan completes 50 years in Hindi cinema on November 7 and remains one of the busiest actors till today.
Venus Williams powered into the Italian Open quarter-finals on Thursday with a dominant 6-1, 3-6, 6-1 victory over fifth seed Johanna Konta.
Images from Day 2 of the Wimbledon tennis championships in London, on Tuesday.
The world number one had arrived in Tokyo aiming to become the first man to win all four majors and an Olympic gold medal in the same calendar year. But that quest came to an end after he was beaten by fifth-ranked German Alexander Zverev in Friday's semi-final.
'I was actually with Serena last week in LA ... she came out to Mexico (for the race) which for me was a real honour to have someone of her power, someone who has achieved so much' 'Venus talks a lot about wisdom and about her growth and about the process of being a sportsman or sportswoman so generally from both of them, I take a lot of inspiration and admire them both hugely'
Serena Williams said on Saturday the COVID-19 outbreak has not only given her a much needed stretch of downtime with her family, it has also turned her into a bit of a "neurotic" and "a recluse" given her past health scares.
The first week of Wimbledon is over and the tournament has been full of surprises. The grudge match between Nick Kyrgios and Rafael Nadal and the rise of the phenom that is Cori 'Coco' Gauff have been the shining moments at this year's tournament.
Gauff vows to be more aggressive in Osaka showdown
Croatia's Mate Pavic and Germany's Laura Siegemund claimed the first silverware of the U.S. Open on Friday, landing the mixed doubles title with a 6-4, 6-4 upset win over the seventh-seeded US partnership of Rajeev Ram and Coco Vandeweghe.
The win burnished Murray's reputation as one of the world's leading doubles exponents,
The ISRO plans to send three Indians to space by 2022, an announcement made by Prime Minister Narendra Modi during his last Independence Day speech.