Jiri Granat has found clay courts difficult, recording 18–27 across 45 matches (40.0%). 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): Jiri Granat 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: 15–24 (38.5%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 1977 — 3–4 (42.9%) from 7 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.