[1] In October, Martineau won his first ITF title in Saint-Dizier, France, defeating fellow countryman Corentin Denolly in the final.

In November, Martineau made his ATP Tour debut at the 2023 Moselle Open after entering the singles main draw as a lucky loser.

At the same tournament, Martineau recorded his first ATP win in doubles by reaching the quarterfinal, playing along with Ugo Blanchet, after the pair received a wildcard to the main draw.

[4] In March, Martineau won his first doubles title on the ATP Challenger Tour at the 2024 Kiskút Open paired with Titouan Droguet.

In June, Martineau qualified for the main draw at the Stuttgart Open, his second career match on the ATP Tour, losing to Denis Shapovalov in the first round.