Former world cruiserweight champion David ‘The Hayemaker’ Haye has offered to box in Germany on a K2 Promotions show in order to revive negotiations for a summer showdown with WBO and IBF world heavyweight champion Wladimir Klitschko. Originally scheduled to take place on June 20 at Stamford Bridge in London, Haye’s eagerly anticipated duel with Klitschko has hit a series of snags in recent weeks, and now appears on the brink of collapse.