[3] In 2016, he was ultimately overlooked for Olympic qualification in favour of fellow super heavyweight boxer Joe Joyce (who went on to claim the silver medal in Rio 2016); however, he did make the British Lionhearts squad for their maiden WSB final against the Cuba Domadores and won his match against Lenier Pero, thereby denying the Domadores what would have otherwise been a 10–0 whitewash.

[6] In 2018, he beat Satish Kumar in the Commonwealth Games super heavyweight final, taking a unanimous judges' decision to claim gold.

[7] In 2019, Clarke was selected to compete at the European Games in Minsk, Belarus,[8] where he suffered a surprise defeat to Nelvie Tiafack in the round of 16.

[9] On his World Championships debut, he was originally deemed to have beaten Maksim Babanin by split decision (3:2) in the quarterfinals; this result was later overturned by a bout review jury on appeal.

[14] Clarke challenged British, Commonwealth and WBO European heavyweight champion Fabio Wardley at The O2 Arena in London on 31 March 2024 with the fight ending in a split draw.