In July, Janvier won his first ITF title at the Serbia F6, defeating Tomislav Jotovski in the final.

In January, Janvier made his Grand Slam qualifying debut at the Australian Open, losing in the second round to Daniel Brands.

In October, Janvier won his first ATP Challenger singles title in Casablanca, defeating Stefanos Tsitsipas in the final.

In June, Janvier was awarded a wildcard to the French Open,[1] losing in the first round to twenty first seed Kei Nishikori.

In May, Janvier made his debut on the ATP Tour as a qualifier at the Lyon Open, losing in the first round to Richard Gasquet.