American doubles player Mike Bryan has been fined $10,000 (£8,222) for using his racquet to make a shooting gesture at a line judge during the US Open.
The 41-year-old turned his racquet upside down and pointed it at the official after successfully challenging an incorrect call.
It came during a second-round win for Bryan and brother Bob against Roberto Carballes Baena and Federico Delbonis.
Bryan has since apologised, saying the gesture "was meant to be playful".
On Saturday, seven people were killed in Texas in the latest of a several mass shootings to take place in the United States in 2019.
"We won the point and the gesture was meant to be playful," said Bryan in a statement quoted by the New York Times.
"But given the recent news and political climate I understand how my gesture could be viewed as insensitive. I promise that I will never do anything like this again."