London, June 24 : Eleven stalkers known to target players such as Maria Sharapova and the Williams sisters have been banned from Wimbledon and warned to stay away from the area.
Stalkers have targeted Maria Sharapova. The trouble-makers have been sent letters telling them to steer clear from the two week tournament.
The "fixated individuals" are well known to police and tennis authorities and all security staff have been briefed to keep watch, The Telegraph reported.
Photographs and intelligence have been distributed to staff at the gates.
Superintendent Pete Dobson, from the Metropolitan Police, said: "There are some individuals who are well known to the police, the All England Club and the tennis authorities."
"They have been written to and banned from entering the club and asked not to attend," he added.
A police source said: "Maria Sharapova does have some fixated individuals interested in her, as do Venus and Serena Williams. I would say the two sisters have had the most interest over the years."
"There is a mix of people from abroad and the UK who are known to us. There are no specific threats this year although there have been in the past, several years ago," the source said.
Dobson said a restraining order had been sought from an American court against the relative of one player, thought to be a junior female competitor.
Police have written to nearly 30 ticket touts who have attended past tournaments and told them to stay away.
They are also using legislation normally reserved for troublesome youths in town centres and housing estates to cut down on trouble.