By Ruslan Chikov

Retired heavyweight Corrie Sanders recently spoke about the Klitschko brothers, Wladimir and Vitali. Sanders knocked out Wladimir in two rounds in 2003, but was later knocked out by older brother Vitali in seven rounds in 2004. He said Wladimir Klitschko is a very big fighter and none of the current contenders are able to beat him because they don't fight brave enough to force Wladimir to make mistakes.

"He's very big and there aren't any strong contenders. I don't think he's invulnerable. I do not know, whether he can take a really good accurate punch. An opponent has to be brave and place constant pressure on him. Only then will Wladimir make mistakes," Sanders was quoted by Golzka. "Without a doubt Wladimir underestimated me and thought the fight was already won."

Sanders would have liked a rematch with Wladimir but it never happened. He doesn't think Vitali is the same fighter who beat him and sees the WBC champion slowing down due to age.

"Yes, it would have been nice to fight [Wladimir] again. I don't know why he never wanted it. I fought against Vitali, who back then was considered the best heavyweight. But age has caught up with Vitali and he looks very slow with each passing fight. Back when I lost to him in 2004, he was different fighter, who was quicker and stronger - but he is so big that it's tough to beat him," Sanders said.