Roy Barth has found clay courts difficult, recording 6–26 across 32 matches (18.8%). 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): Roy Barth 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: 0–3 (0.0%); best-of-three: 6–23 (20.7%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on clay.

Best season: 1970 — 3–7 (30.0%) from 10 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.