Thierry Guardiola has found clay courts difficult, recording 7–27 across 34 matches (20.6%). 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): Thierry Guardiola has struggled at Grand Slam level on clay: 2–5 (28.6%) in 7 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): Thierry Guardiola has struggled at Masters level on clay: 1–4 (20.0%) in 5 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

By format on clay — best-of-five: 2–5 (28.6%); best-of-three: 5–22 (18.5%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 1994 — 2–3 (40.0%) from 5 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.