Hooper started his career aged 21 on April 2013. His career record to date stands at 9 wins and he remains unbeaten. Hooper's longest KO streak is 6 fights long out of his 9 pro career fights.
An explosive pro debut saw Hooper face Garth Murray in a 6 round debut fight. Damien became only the 3rd person to stop Murray shy of the full distance, stopping him in the 5th. Hooper built on his successful start to his career by fighting 5 times in 2013 which included fights against Yodkhunsuk Mor poowana, Garth Murray and Togasilimai Letoa to name just a few.
Hooper then went on to fight and beat Togasilimai Letoa on August 8th, 2013 maintaining his unbeaten record. Letoa was stopped in the 5th round via KO meaning Hooper was the 3rd person to stop this opponent. 2 wins followed taking Hooper's winning streak to 6 wins.
Hooper then went on to fight and beat Young-don Um on March 19th, 2014 maintaining his unbeaten record. Young-don Um was Hooper's next opponent of his career in 2014. The fight was scheduled for 6 and Hooper was the 5th person to go the distance with Um.
Josh Webb was up next for Hooper on June 20th, 2014. Hooper continued with his winning streak by beating Webb. Hooper was the 2nd person to stop Josh and he did it in the 3rd round via RTD.
The unbeaten run continued with the defeat of Joel Casey in his latest fight on July 30th, 2014, taking his winning record to 9 wins. Hooper was the 5th fighter to stop Casey in round 7 of a 10 round fight, Hooper won via KO.