Amir Khan feels Tyson Fury should ‘stay away’ from Oleksandr Usyk in order to avoid his eye injury being opened up when the two men finally fight on May 18. The pair had been due to do battle in Saudi Arabia in December, and then February, only for the showdown to be pushed back. Fury’s eye injury is to blame for the latest delay, which has frustrated fans of the sport. The 35-year-old was caught in sparring and, due to the deep gash, boxing organisers had no choice but to call another postponement. Fury will still fancy his chances of beating Usyk in the Middle East, especially due to his vas…