[7] He won his first singles ATP Challenger title at the 2024 Nottingham Open as a qualifier, getting his first top-100 win against Shang Juncheng in the quarterfinals, and defeating compatriot Charles Broom in the final.

[14][15] He recorded his first Major win over debutant Alejandro Moro Canas and moved 50 positions up into the top 225 in the rankings.

[2] Fearnley beat Coleman Wong in straight sets in the final to win his second ATP Challenger title.

[25][26][27][28] Having qualified for the Stockholm Open in October,[29] Fearnley won his 13th match in a row and second at the ATP Tour level with a first round success against Corentin Moutet.

[32] For the first time in his career, Fearnley gained direct admission into a Grand Slam tournament main draw, entering the Australian Open with his ranking of 99 after the withdrawal of Sebastian Ofner.

[33] Wins over Nick Kyrgios[34][35] and Arthur Cazaux saw him reach the third round,[36] where his run was ended by second seed Alexander Zverev.

[37] Fearnley made his debut for the Great Britain Davis Cup Team in their qualifier against Japan, defeating Kei Nishikori.