What is the World Boxing Super Series?
The World Boxing Super Series has been described as the "Champions League of boxing" with two tournaments, one for cruiserweights and one for super-middleweights.
Each category offers a $25m (£19m) prize fund and a trophy named after late boxing great Muhammad Ali, with the winner of each expected to receive $10m (£7.6m) in total over the three victories needed to land the title.
World championship belts are also on the line in the new event so Eubank Jr, who weighed in a pound under the 12st limit recorded by his opponent, remains IBO world super-middleweight champion.
Eubank Jr's only defeat was a controversial split-decision loss to compatriot Billy Joe Saunders at middleweight in November 2014.
