The man shouted personal insults about Swiatek’s family and had previously sent abusive online messages to her through social media.

“The Miami incident appears to be a direct transition from verbal aggression online to harassment in the real world,” Swiatek’s representatives said.

“He was aggressive and taunting.”

The BBC said Swiatek’s team reported the incident and that tournament organisers and the WTA put extra security measures in place around the Pole, who is scheduled to face Philippine wildcard Alexandra Eala in the quarterfinals today.

“Security is a top priority. We monitor the network to catch these types of issues,” Swiatek’s spokesman said.

“Constructive criticism is one thing, and threats, hate speech or even disturbance during training is another – this cannot be condoned.”

The WTA did not immediately respond when asked by Reuters to comment.

The incident happened a little over a month after a spectator was removed from the Dubai Championship after causing 2021 US Open champion Emma Raducanu distress by exhibiting “fixated behaviour” towards the British player.