George Bastl has found clay courts difficult, recording 4–14 across 18 matches (22.2%). 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): George Bastl has yet to record a win on clay at this stage — 0–1 across 1 Grand Slam match. Breaking through here would mark a significant step forward on this surface.

By format on clay — best-of-five: 1–2 (33.3%); best-of-three: 3–12 (20.0%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 2000 — 2–4 (33.3%) from 6 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.