On Saturday, Wladimir, 28, fights Lamon Brewster in Las Vegas for the World Boxing Organization title, the Washington Post reported Friday.
On April 24 his brother Vitali, 32, fights Corrie Sanders for the World Boxing Council belt. Vitali is ranked No. 1 and Sanders No. 2.
"There are a lot of actors, but only a few stars," Vitali Klitschko said. "The heavyweights need a star. There are a lot of good fighters, but no one people say, 'Hey, that man is the star.' My brother and I want to be the stars."
The Klitschkos are not the only ones seeking part of Lewis' legacy.
On April 17 in New York's Madison Square Garden Chris Byrd-Andrew Golota will fight for the International Boxing Federation's heavyweight title. That same day John Ruiz defends his World Boxing Association heavyweight champiosnhip against Fres Oquendo, also in New York.
In 1999 Lewis took ownership of all major heavyweight titles when he beat Evander Holyfield.