United States' Serena Williams returns the ball to Spain's Carla Suarez Navarro.
The incident occurred during a practice session before the start of this year's tournament, reports Xinhua news agency.
The seven-time Wimbledon champion, playing just her sixth tournament of 2019, defeated Carla Suarez Navarro on Monday to reach the quarter-finals.
Meanwhile, Italy's Fabio Fognini was fined $3,000 for saying during his third-round loss that he wished a bomb would hit Wimbledon.
Australian Nick Kyrgios was imposed two fines, one for $3,000 from the first round and another for $5,000 from the second round, both for unsportsmanlike conduct.
He lost to Rafael Nadal in four sets in the second round.
Indo-Asian News Service
Tennis star Serena Williams has revealed that she has apologised to Japan's Naomi Osaka who defeated her in the finals of the US Open last year.
US tennis superstar Serena Williams topped Forbes magazine's list of the highest paid women in sports for the fourth straight year on Tuesday.
Serving only so-so, failing to convert all but one of her break chances and missing groundstrokes with alarming regularity, Williams stunningly exited in the third round at Melbourne Park, beaten 6-4, 6-7 (2), 7-5 by 27th-seeded Wang Qiang of China on Friday.
“Yes, not only we did we make an offer to the Board of Control for Cricket in India (BCCI) to host the IPL but we are also confident of getting the reply in the affirmative from the Indian board,” said Usmani.
Robert Lewandowski scored his 30th league goal of the season on Saturday as Bayern Munich came from behind to claim a 4-2 victory at Bayer Leverkusen and move a step closer to the Bundesliga title.
World number one Novak Djokovic described the strict hygiene restrictions under which the US Open is likely to be played as “extreme” and a cap on support teams as “really impossible” on Friday.