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Sosnowski, 31, would be a tough rival for 38-year-old Klitschko. BERLIN, March 9 (Reuters) - WBC world heavyweight champion Vitali Klitschko will defend his title against Poland's Albert Sosnowski in Schalke's soccer stadium on May 29, the Ukrainian said on Mar. 9.

The 38-year-old Klitschko, whose brother Vladimir will defend his WBO, IBF and IBO titles against Eddie Chambers on March 20, said Sosnowski, 31, would be a tough rival.

"He is experienced, he is fast and he is a tough boxer who will try everything to take my belt. But I will not let it happen," Klitschko said in a statement. "I promise all fans an unforgettable evening."

Sosnowski, the European Boxing Union heavyweight champion with 45 wins, two defeats and a draw, was due to defend his European title against Audley Harrison in London in April but cancelled to fight Klitschko.

"This is a dream come true," he said. "I was already training for the Harrison fight when I suddenly get the chance of a lifetime. Vitali is way past his peak," he said.