Josselin Ouanna has found clay courts difficult, recording 4–7 across 11 matches (36.4%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar.

At Grand Slam level (Roland Garros): Josselin Ouanna is 3–3 (50.0%) across 6 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

By format on clay — best-of-five: 3–3 (50.0%); best-of-three: 1–4 (20.0%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.