Wladimir Klitschko will defend his four heavyweight titles against little-known Francesco Pianeta in May. Klitschko's management says the fight will take place May 4 in Mannhein, Germany. Klitschko holds the IBF, IBO, WBA and WBO heavyweight belts. Pianeta was born in Italy but has lived in Germany since he was six. The 28-year-old challenger has an undefeated record of 28 wins with 15 KOs and one draw, fighting low-ranked boxers. He was briefly Klitschko's sparring partner last year. Klitschko has a 59-3 record, with 51 KOs

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