Early career

Buatsi made his professional debut on 1 July 2017, when he fought Carlos Mena at The O2 Arena. Buatsi won the fight by knockout in the second round. He next fought on 1 September against Baptiste Castegnaro, winning by knockout in the fifth round. On 28 October 2017, on the undercard of Anthony Joshua vs. Carlos Takam at the Principality Stadium in Cardiff, Wales, Buatsi fought Saidou Sall in a six round bout, winning the bout 60-54.

Buatsi’s first fight of 2018 was against Jordan Joseph, he won the bout by stoppage in the second round after Joseph’s corner threw the towel in. He went on to defeat Bartlomiej Grafka 60-54 over six rounds on 31 March and Stephane Cuevas by knockout in the fifth round on the undercard of Tony Bellew vs. David Haye on 5 May.

On 23 March 2019, Buatsi defeated Liam Conroy via technical knockout in round three to claim the vacant British light-heavyweight title at the Copper Box Arena in London, England.^[7][8]

In his US debut, on the Anthony Joshua vs. Andy Ruiz Jr. undercard at Madison Square Garden, Buatsi defeated Mexican veteran and former title challenger Marco Antonio Peribán within four rounds. Buatsi first dropped his opponent, and after he got up, unleashed a flurry of shots at him, forcing the referee to stop the fight.^[9]

In his next fight, Buatsi faced another veteran, Canadian Ryan Ford. Ford proved to be a good test for the young Buatsi, but in the end, Buatsi managed to get a seventh-round stoppage.^[10]

On 15 May 2021, Buatsi fought Frenchman Daniel Dos Santos at the AO Arena in Manchester, winning by devastating knockout with a well-timed right hand in the fourth round.^[11] Buatsi followed this up by beating Ričards Bolotņiks with an eleventh round knock out as the main event on the final instalment of Matchroom Boxing's Fight Camp series.^[12] For the last two fights, Joshua has been under the tutelage of Virgil Hunter, the former trainer of Andre Ward, with both of his most recent camps taking place at Virgil's gym in California.^[13]