Tyson Fury may only have the pleasure of being the unified heavyweight champion of the world for a few moments before it’s snatched away from him if he defeats Oleksandr Usyk tonight. Due to the complexities of the world boxing organisations, it’s rare for a unification bout in modern boxing. Lennox Lewis was the last undisputed heavyweight champion of the world back in 1999 when he defeated Evander Holyfield. Fury and Usyk now get the chance to write history this evening in Saudi Arabia with all the major belts on the line for the first time this century. The Gypsy King is the WBC and lineal …