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Ukranian boxer Wladimir Klitschko reacts after beating German-Italian Francesco Pianeta with knockout in a WBA-, IBF,- WBO- and IBO heavyweight world championship fight in Mannheim, Saturday, May 4, 2013.
MANNHEIM, Germany—Wladimir Klitschko stopped Francesco Pianeta in the sixth round Saturday night to retain the WBA and IBF heavyweight titles.

The Ukrainian was never troubled by Pianeta, finishing off the previously unbeaten Italian southpaw with a right-left combination. Pianeta stayed down before attempting to continue, but there was no point in delaying the inevitable and referee Ernie Sharif ended the bout 2:52 into the round.

"Francesco tried. He has a fighting heart," Klitschko said. "He's a positive example in boxing. I'm sure he's learned a lot and that he has a great future ahead of him."

Klitschko rocked Pianeta inside the first 30 seconds, knocked him to the canvas with a straight right down the middle in the fourth, and again with a left blow in the fifth.

Ukraine’s Wladimir Klitschko, right, knocks out Italy’s Fancesco Pianeta during the heavyweight world championship fight in Mannheim, Germany,
Ukraine's Wladimir Klitschko, right, knocks out Italy's Fancesco Pianeta during the heavyweight world championship fight in Mannheim, Germany, Saturday, May 4, 2013. ((AP Photo/Daniel Maurer))

The 37-year-old Klitschko improved to 60-3 after his 52nd knockout, while Pianeta dropped to 28-1-1.

"I'm very disappointed and sad," said Pianeta, a cancer survivor who lives in Gelsenkirchen, Germany. "I can't say anything. It wasn't my day. He's the world champion. It wasn't enough. That was rubbish today."

The fighters worked together briefly last year and Klitschko tried to be kind to his former sparring partner.

"Francesco wasn't easy to box," Klitschko said. "He punched with the hardest punches I've ever felt. Luckily, they didn't hit me."

Vitali Klitschko, who holds the WBC belt, said he had no worries ahead of his younger brother's 23rd championship bout.

"My brother was very strong," Vitali Klitschko said.


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"Francesco has a big heart. You have to pay him respect."

Next up for the younger Klitschko is a likely bout with mandatory challenger Alexander Povetkin of Russia, the "regular" WBA champion after Klitschko was elevated to "super champion" status.

Ukranian boxer Wladimir Klitschko reacts after beating German-Italian Francesco Pianeta with knockout in a WBA-, IBF,- WBO- and IBO heavyweight world
Ukranian boxer Wladimir Klitschko reacts after beating German-Italian Francesco Pianeta with knockout in a WBA-, IBF,- WBO- and IBO heavyweight world championship fight in Mannheim, Saturday, May 4, 2013. ((AP Photo/Michael Probst))

Ukraine’s Wladimir Klitschko celebrates after defeating Italy’s Fancesco Pianeta during the heavyweight world championship title match in
Ukraine's Wladimir Klitschko celebrates after defeating Italy's Fancesco Pianeta during the heavyweight world championship title match in Mannheim, Germany, Saturday, May 4, 2013. Klitschko retained his WBA and IBF heavyweight boxing titles with a sixth-round knockout of Pianeta on Saturday. ((AP Photo/Daniel Maurer))

Ukranian boxer Wladimir Klitschko, left, and German-Italian Francesco Pianeta fight each other in a WBA-, IBF,- WBO- and IBO heavyweight world championship
Ukranian boxer Wladimir Klitschko, left, and German-Italian Francesco Pianeta fight each other in a WBA-, IBF,- WBO- and IBO heavyweight world championship fight in Mannheim, Saturday, May 4, 2013. Klitschko won with knockout in round six. ((AP Photo/Michael Probst))