Five-time major champion Iga Swiatek is being protected by increased security after an “aggressive and taunting” fan verbally abused her at the Miami Open.
Swiatek was targeted by the man in a practice session on Saturday.
It is believed the man shouted personal insults about Swiatek’s family.
The world number two’s representatives says the man 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,” the Polish player’s team said.
“He was aggressive and taunting.”
Swiatek’s representatives added the incident was immediately reported to tournament organisers.
Her experience comes a month after Britain’s Emma Raducanu was targeted by a stalker at the Dubai Tennis Championships.
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