Ivan Kley has found clay courts difficult, recording 4–24 across 28 matches (14.3%). 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): Ivan Kley has yet to record a win on clay at this stage — 0–2 across 2 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.

By format on clay — best-of-five: 0–5 (0.0%); best-of-three: 4–19 (17.4%). 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: 1985 — 3–9 (25.0%) from 12 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.