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.
Simona Halep kept alive hopes of regaining the world number one ranking Sunday, beating Polona Hercog 5-7, 7-6 (7/1), 6-2 to reach the last 16 of the WTA and ATP Miami Open.
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