- Andy Ruiz Jnr is the new heavyweight champion after shocking Anthony Joshua
- The Mexican shocked the world by forcing a seventh-round stoppage
- In doing so he became the WBA, WBO, IBO, and IBF heavyweight champion
- The IBF could call on him to defend against mandatory challenger Kubrat Pulev
Andy Ruiz Jr could lose one of his four world titles before he even has the chance to defend it.
The Mexican underdog shocked the world by beating Anthony Joshua on Saturday night, knocking the Brit down four times before forcing a seventh-round stoppage.
In doing so he became the WBA, WBO, IBO, and IBF heavyweight champion.
A rematch has already been penciled in for the end of the year in the UK but all four belts may not be on the line.
One of the four sanctioning bodies, the IBF, could call on Ruiz to defend their belt against mandatory challenger Kubrat Pulev.
The 29-year-old would decline in favour of another big money showdown with Joshua, meaning he would be stripped of the title.
Speaking about a rematch, Joshua’s promoter Eddie Hearn said: ‘We’ll make the rematch in the UK in November/December, but tonight is all about Andy Ruiz.
‘Now we’ll see what AJ is about. He’s got the heart of a lion, I’m sure he’ll come back.
‘Now we know what fight is next, and we’ll see a huge rematch at the end of the year.
‘Maybe this is what he needs. He’ll have another shot at Ruiz later but he needs to win, it’s a must win fight for him now.