Klitschko agrees to fight Williams
 |  Williams (left) caused a major shock by beating Tyson in July |
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NEW YORK -- Vitali Klitschko will defend his WBC heavyweight title against Britain's Danny Williams in Las Vegas on December 11.
The bout will be staged at the Mandalay Bay Casino, the promoters announced in New York.
Williams's promoter Frank Warren had said earlier in the month the fight would take place in New York.
Former British and European champion Williams has been given a title shot after he caused one of the biggest upsets in boxing by knocking out former champion Mike Tyson in the fourth round in July.
"Vitali has made a big mistake by agreeing to fight me," Williams said. "I knocked out Tyson and I am for real.
"It is time for the world heavyweight championship belt to return to England."
Klitschko stopped South African Corrie Sanders in April to win the title vacated by Briton Lennox Lewis a fortnight after the Ukrainian's brother Vladimir had lost his bid for the World Boxing Organization version of the title.
"I will prove once again that I am the best heavyweight in the world," said Klitschko.
"Danny Williams may have shocked the world once when he knocked out Tyson, but he will not shock the world again."
