 Benn made his professional debut in April 2016 aged 19 at The O2 Arena in London defeating Bulgarian Ivailo Boyanov by technical knockout in the first round.He followed this with a points victory over Luke 'The Nuke' Keleher at The SSE Hydro in Glasgow in May, and a knockout of Lukas Radic in June On 10 September 2016, Benn was due to fight Silvije Kebet on the undercard of Gennady Golovkin vs. Kell Brook.After Silvije Kebet pulled out Benn defeated late replacement Joe Ducker by technical knockout in the second round to take his unbeaten record to 4–0.