TYSON FURY’S dad John was left with blood pouring down his forehead as the build up to the undisputed world heavyweight clash with Oleksandr Usyk got off to an explosive start in Riyadh.

The rival camps had to be separated by security at the hotel where today’s media activity was being held.

John was left with a cut from an alleged headbutt, and the blood continued to flow despite the 59-year-old’s attempts to wipe it away. He had to be restrained repeatedly while Usyk’s camp chanted “Usyk, Usyk, Usyk.”

When Tyson saw his dad for the first time since the fracas, having missed it while giving an interview elsewhere, he said: “How did you cut yourself like that?”

The unbeaten rivals meet for the first time at the Kingdom Arena with Saturday’s clash crowning the first undisputed heavyweight champion since Lennox Lewis in 2000 and the first of the four-belt era.

WBC champion Lewis won the WBA and IBF titles from Evander Holyfield in 1999 and Fury feels the weight of history as he declared: “I can’t wait.”

“It’s unbelievable to be out here. Everyone is on a high. Big-time boxing in Saudi Arabia is fantastic,” Fury said.

“I’m going to enjoy this week because it’s been many years coming. So we’ll enjoy it. I feel on top of the world and I can’t wait.”