John Cooper has found clay courts difficult, recording 16–22 across 38 matches (42.1%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Claimed 1 title on clay: Hilversum.

At Grand Slam level (Roland Garros): 1–2 across just 3 matches — still very early days at this level on clay.

One final reached on clay, converted into a title — a perfect finals record on this surface. 1 semifinal. 1 quarterfinal.

By format on clay — best-of-five: 6–8 (42.9%); best-of-three: 10–14 (41.7%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Best season: 1969 — 5–3 (62.5%) from 8 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.

John Cooper recorded a notable 6-match winning streak on clay — a run that demonstrates consistency across consecutive draws on this surface.