The frustrated 24-year-old shook hands with his opponent and the umpire before he strode off the court, effectively defaulting himself from the contest.
Summary of sports events and persons who made news on Wednesday.
Sharapova's quarter-final defeat by Williams at the 2016 Australian Open was the last competitive match the Russian played for 15 months after she received a doping ban while American Williams was on a maternity break for most of 2017.
A round-up of Sunday's action in the South American World Cup qualifiers.
Organisers of this year's US and French Opens established bio-secure 'bubbles' for players, who were not allowed to leave their hotel rooms except to train and play.
Colombia head to Copa semis after penalties win over Uruguay
Images from the Serie A and La Liga matches played on Saturday.
The Wimbledon Championship runner-up is expected to be a top draw at the ATP 250 event to be played at the Mhalunge Balewadi Stadium in Pune.
The win extends United's unbeaten run in all competitions to 14 matches and secures a 30th appearance in the last four of the FA Cup for the club.
Brandon Fernandes returned to the side as Goa coach Juan Ferrando named three changes to the line-up that lost against ATK Mohun Bagan with Aiban Dohling and Jeorge Ortiz being the other two.
Sania Mirza and her Czech partner Barbora Strycova stormed into the quarter-finals of the BNP Paribas Open 2017 tennis tournament with a straight-set win over their opponents in the women's doubles at Indian Wells.
'You cannot achieve everything in one day and in the long path, there will be ups and downs in your life.'
The foreign contingent was forced to stay back after the I-League season had been stopped abruptly due to the outbreak of the pandemic.
There is space for Juan Mata at Manchester United but the midfielder must fight to break into the first team, manager Jose Mourinho has said.
The 30-year-old was excluded from Spain's squad for this year's World Cup but is hopeful of turning his fortunes around under former Barcelona boss Enrique.
The global number of new cases has been increasing for more than a month, with over 4 million cases reported in the past week - July 26 to August 1, the update said.
German fourth seed Alexander Zverev beat Spaniard Pablo Carreno Busta 7-6(4) 6-2 on Friday to set up a Miami Open final showdown against big-serving American John Isner, who earlier overwhelmed Juan Martin del Potro.
Wawrinka's last ATP title came in 2017 before the former world number three underwent knee surgery.
John Isner pushed on towards a Tour finals spot on Friday when he made it through to the semi-finals of the Paris Masters with a 6-4, 6-7(5), 6-4 win over Argentine Juan Martin Del Potro as the tournament was hit by the withdrawal of Rafael Nadal.
Jenson Button won a 'Legends Trophy' esports race on Saturday with fellow retired Formula One world champion Jacques Villeneuve going from last to sixth on his virtual debut.
Barcelona continued their rampant run of domestic form to beat Osasuna 2-0 away from home on Saturday and move to within two points of La Liga leaders Atletico Madrid, with Lionel Messi setting up goals scored by Jordi Alba and teenager Ilaix Moriba.
Six months on, with an Olympic silver medal in the bag, the Argentine beat 11th seed David Ferrer of Spain 7-6, 6-2, 6-3 to reach the US fourth round for the first time since 2012.
Argentine striker Carlos Tevez will join Shanghai Shenhua from boyhood club Boca Juniors, the Chinese Super League side said on Thursday.
Professional sports events in Italy have been played without fans since March due to the COVID-19 pandemic but sports minister Vincenzo Spadafora said fans would be allowed to attend the closing stages of the tournament on Sunday and Monday.
Rafael Nadal was at his awe-inspiring best as he recovered from a first set wobble to crush Juan Martin del Potro 4-6, 6-0, 6-3, 6-2 in the US Open semi-finals on Friday and move within reach of a 16th Grand Slam title.
Casemiro produced a performance worthy of a top striker by scoring twice in a 2-1 win for Zinedine Zidane's side over Sevilla
Juventus have 13 points from seven games, three behind leaders AC Milan who host Verona later on Sunday. Lazio have 11 points.
Leicester City's Kelechi Iheanacho scored two poacher's goals as they beat Manchester United 3-1 in their FA Cup quarter-final on Sunday to set up a last-four clash against Southampton.
Highlights from all the stages of the the Tour de France cycling race.
Five images from last week's action in Europe for you to savour.
Manchester United's Spanish international Juan Mata has promised to give 1 per cent of his earnings to charity and wants all fellow professional footballers to do the same.
Novak Djokovic, Rafael Nadal and Johanna Konta progressed to the Italian Open semi-finals on Friday, but Roger Federer and Naomi Osaka were forced to withdraw with injury problems. World number one Osaka pulled out of her quarter-final meeting with Kiki Bertens due to a thumb injury before 37-year-old Federer announced his withdrawal because of a problem to his right leg.
'When you don't have that confidence to play three, four hours with a good backhand against Rafa, is just matter of time to get down your game'
Thousands of revelers hurled tomatoes at each other, cavorting in the red pulp beneath their feet in the Spanish town of Bunol. Organisers of the annual Tomatina festival tossed 145 tonnes of over-ripe tomatoes into the crowd from six large trucks, quickly converting the town into a sea of pink and red.
Former Europa League winners Manchester United booked a quarter-final spot in the tournament after their second-string side laboured to a 2-1 home win over LASK Linz on Wednesday to seal a 7-1 aggregate rout of the Austrian side.
Here are some photos from the memorable evening...
Argentina's Juan Martin del Potro knocked out third seed Roger Federer to set up a semi-final against Rafael Nadal, in New York, on Wednesday.
On a good night for English clubs in the Europa League, Manchester United hammered AZ Alkmaar 4-0, while Wolverhampton Wanderers also thrashed Besiktas 4-0 in Group K, and Arsenal came from two goals down to draw 2-2 away to Standard Liege and finish first in their pool. The upset of the night came in Group J as Crivelli scored a 90th-minute winner against Borussia Moenchengladbach to send Basaksehir through and knock the Germans out, with AS Roma grabbing the runner-up spot thanks to a 2-2 home draw with Wolfsberger as the Europa League group stage concluded on Thursday.
PSG will need to rely on their attack against the team they knocked out in the semi-finals last season.
IMAGES from soccer matches played across Europe on Saturday.