Graham Stilwell has found clay courts difficult, recording 24–52 across 76 matches (31.6%). 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): Graham Stilwell has struggled at Grand Slam level on clay: 2–4 (33.3%) in 6 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

By format on clay — best-of-five: 11–10 (52.4%); best-of-three: 13–42 (23.6%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 1969 — 7–2 (77.8%) from 9 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.