He won his first ATP match in Montpellier against Steve Darcis in 2019 before losing to compatriot Jérémy Chardy and made the final in doubles, partnering Benjamin Bonzi.

On his Grand Slam singles debut at the 2019 French Open, Hoang reached the third round as a wildcard defeating 23rd seed Fernando Verdasco[1] before losing to 14th seed compatriot Gaël Monfils.

He also made his debut as a wildcard at the US Open where he reached the second round defeating Leonardo Mayer in a five-set match before losing to 28th seed Nick Kyrgios.

At the 2020 French Open in doubles as a wildcard Hoang reached the third round for the first time in his career partnering Benjamin Bonzi where they were defeated by 8th seeded German duo and eventual champions from Germany Kevin Krawietz/Andreas Mies.

Hoang qualified for the first time and reached the second round of the 2021 Wimbledon Championships on his debut where he defeated fellow qualifier Zhang Zhizhen in a five-set match[2] before losing to Sebastian Korda.