His break out fight came in 2015, when he challenged Hungarian Zoltan Csala for the vacant
IBO Inter-Continental
Heavyweight title. Cornish dominated Csala and won the fight via a technical knockout in the fourth round.
Cornish vs. Joshua On 12 September 2015, Cornish fought
Anthony Joshua for the Vacant Commonwealth Belt. Cornish was stopped by the referee just 90 seconds into the fight. He was the first Scottish heavyweight to fight for the commonwealth heavyweight title. Cornish remained largely absent from the public eye following the Joshua fight, but since regrouped in 2016 with two points victories in bouts fought in Scotland. In 2017, he became the first Scottish boxer to fight for the British heavyweight title against
Sam Sexton. His bid for the title proved unsuccessful, as he lost by unanimous decision to Sexton. In March 2019, Cornish announced that he would be retiring from boxing on medical grounds after a brain scan. He described his decision to retire as "devastating". ==Personal life==