David Prinosil has found clay courts difficult, recording 16–48 across 64 matches (25.0%). 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): David Prinosil has struggled at Grand Slam level on clay: 5–10 (33.3%) in 15 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): David Prinosil has struggled at Masters level on clay: 5–13 (27.8%) in 18 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

vs. Top 10 on clay: 1–2 (33.3%, 3 matches). Top 10 opponents have represented a clear ceiling on clay; addressing that deficit is the single biggest lever for improving the overall record here.

By format on clay — best-of-five: 6–11 (35.3%); best-of-three: 10–37 (21.3%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 1992 — 6–6 (50.0%) from 12 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.