Check out some of the up-and-comers who could cause an upset at Wimbledon this year.
Petra Martic kept her composure to advance to the Round of 16
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.
The 28-year-old said beating American great Williams was the finest win of her career, outstripping her upset of world number one Ash Barty at last year's US Open.
He has three titles to his name this season, including winning a third Masters 1000 in Madrid, and on Saturday he will become the first German for 15 years to contest a semi-final match at the season-ending ATP Finals.
Unseeded Rohan Gajjar of India caused the first upset in the CCI-ITF US$15,000 men's Futures tennis tournament when he stunned fifth seed Gerald Melzer of Austria in the first round at the Cricket Club of India in Mumbai on Tuesday.
Little-known 21-year-old Andrej Martin of Slovakia created the biggest upset in the Singapore ATP Challenger, upsetting Asian Games gold medalist and top seed Somdev Devevarman of India to enter the semi-finals on Friday. On a cloudy day at the Kallang Tennis Centre, the 177-ranked Martin outpaced Somdev to register a 6-3, 6-4 win in 85 minutes.
Catch the emotions at the French Open.
Daniil Medvedev lost his world number one ranking after being defeated by Gael Monfils
First lady Jill Biden cheered her countrywomen to an upset victory over the French in the debut of 3x3 basketball at the Olympics as President Emmanuel Macron watched on from the sidelines.
India's second seeds Purav Raja and Divij Sharan were upset in straight sets in the final of the Tashkent Challenger by the unseeded Russian pairing of Mikhail Elgin and Teymuraz Gabashvili, in Tashkent, on Saturday.
The cartoon has been blasted by numerous athletes, celebrities, journalists and activists
Lucas Pouille was not prepared to say his pulsating four hour, fourth-round upset of 14-time grand slam winner Rafael Nadal at the US Open on Sunday was a career changing moment.
Former world number one Andy Murray withdrew from the Brisbane International with a hip problem on Tuesday, further putting in doubt the Briton's prospects of being fit in time for the Australian Open later this month.
Summary of sports events and persons who made news on Friday.
World number one Rafael Nadal recovered from an upset loss against Belgium's David Goffin to win the deciding doubles match and send Spain into the semi-final of the ATP Cup teams event in Sydney in the early hours of Saturday. Spain will now play host nation Australia in the inaugural event, while Serbia, led by world number two Novak Djokovic, take on Russia.
Top seed Karan Rastogi entered the quarter-finals of the ITF men's Futures Tennis Tournament, scoring a 6-1, 6-7(6), 6-1 victory over Sanam Singh.
Somdev Devvarman and Sania Mirza will carry India's gold medal hopes in the tennis event of the Commonwealth Games as both progressed to the singles final even as the star pair of Leander Paes and Mahesh Bhupathi bit the dust in a big upset on Friday.
An emotional Sania Mirza broke down during a television interview on Friday following Telangana BJP leader K Laxman's controversial remark that she is 'Pakistan's daughter-in-law'.
Naomi Osaka has sacked her second coach in seven months, splitting with Jermaine Jenkins
IMAGES from Day 1 of the Wimbledon Championships played on Monday.
The top-seeded Serb, who had not dropped a set in four matches since the round of 16 at the Australian Open in January, looked out-of-sorts throughout the 98-minute contest.
The upset left only three of the top 10 seeds still alive in the year's final Grand Slam - number one Serena Williams, who is seeking the fourth women's calendar-year Grand Slam, second seed Simona Halep and fifth seed Petra Kvitova.
The top women's seeds continued to be scattered at Wimbledon on Wednesday, with Caroline Wozniacki's exit meaning five of the top eight were gone before the end of the third day.
Shapovalov will meet Rafael Nadal for a place in the semi-finals.
Second seed Isha Lakhani and No 4 Rushmi Chakravarthi of India crashed out in the quarter-finals, in the Mother's Recipe US $10,000 ITF women's Futures Tennis Tournament on Thursday. On a dramatic day of upsets and a disastrous one for India, qualifier Moe Kawatoko of Japan shocked favourite Lakhani 7-5, 7-5 in an absorbing contest that lasted 100 minutes, while No 8 seed Chun-Yan He of China upset Chakravarthi 6-1, 7-6 (7-4) in 105 minutes.
German teenager Alexander Zverev won his first ATP Tour singles title with a 6-2, 3-6, 7-5 upset win over Switzerland's world number three Stan Wawrinka at the St Petersburg Open on Sunday.
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.
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.
Dominic Thiem will take on Germany's Alexander Zverev in Sunday's US Open final.
IMAGES from the matches played at the Miami Open on Thursday
IMAGES from the PNB Paribas Open played at Indian Wells in California on Monday
Indian tennis ace Sania Mirza and her Swiss partner Martina Hingis lost the opportunity to win their 14th title together after losing the Stuttgart Open final on Sunday.
Dominika Cibulkova took the loss in her stride and focused her energy into her nuptials.
World number one Novak Djokovic and number two Andy Murray crashed out of the Western and Southern Open within an hour of each other on Friday, before Rafa Nadal restored order with a win over old rival Roger Federer.
Images from Day 6 of the 2021 US Open in New York on Saturday.
Swiss teenager Belinda Bencic capped a brilliant run to the Rogers Cup title on Sunday.
Summary of sports events and persons who made news on Monday
Ana Konjuh has opened some eyes at Flushing Meadows as the 18-year-old former world number one junior emerged to reach her first Grand Slam quarter-final at the US Open.
The Australian Open will lose one of its giant killers when South Korean Chung Hyeon meets American Tennys Sandgren in an unlikely quarter-final showdown at the Rod Laver Arena on Wednesday.