WBO light-heavyweight title challenger Nathan Cleverly says Jurgen Braehmer will be his toughest test yet.
The pair clash on May 21 at the 02 Arena, London, as part of a blockbuster bill promoted by Frank Warren.
Cleverly has beaten a string of European and domestic opposition in an undefeeated career that has seen him become interim WBO champion.
But he takes a step up in class when he takes on quality German Braehmer.
"Braehmer's a strong fighter with a great record and a great pedigree," said Cleverly.
"He was world amateur champion so obviously has a bit of class about him.
"I want to win the belt by beating a proper champion and Juergen is a true champion.
"I need a genuine world title fight to see the best of me."