Pairing Mayot again, they were also given a wildcard entry into the main doubles draw of the 2020 French Open but were defeated in the first round by Łukasz Kubot and Marcelo Melo in straight sets.

Cazaux made his singles debut the following year in 2021 Geneva Open as a wildcard, winning his first ATP match against compatriot Adrian Mannarino in three sets.

He made his Grand Slam main draw singles debut at the 2021 French Open as a wildcard where he was defeated by Kamil Majchrzak.

Cazaux won his maiden Challenger title in September 2022 in Nonthaburi, Thailand, entering the main draw as a qualifier and defeating Omar Jasika in the final.

Reaching the final of that same tournament the following week, Cazaux lost to Brit, Stuart Parker, pulling out due to injury in the second set.

[4][5] Continuing his good form, Cazaux reached the final again the following week, losing to Japanese player Sho Shimabukuro in straight sets.

119 in August, Cazaux made his debut at the US Open as a lucky loser, losing to eight seed Andrey Rublev in the first round.

[13] In January, Cazaux won his third Challenger at the Open Nouvelle-Calédonie defeating fellow Frenchman Enzo Couacaud in the final.

[23] Following the late withdrawal of top seed Jannik Sinner at the Paris Masters, Cazaux entered the main draw as a lucky loser replacement directly into the second round.

[24] At the Australian Open, Cazaux defeated 28th seed Sebastián Báez in five sets to reach the second round,[25] where he lost to Jacob Fearnley.