Carlos Gattiker has found clay courts difficult, recording 1–22 across 23 matches (4.3%). 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): Carlos Gattiker has yet to record a win on clay at this stage — 0–3 across 3 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.

vs. Top 10 on clay: 0–3 (0.0%, 3 matches). Top 10 opponents have represented a clear ceiling on clay; addressing that deficit is the single biggest lever for improving the overall record here.

By format on clay — best-of-five: 0–3 (0.0%); best-of-three: 1–19 (5.0%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Best season: 1979 — 1–7 (12.5%) from 8 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.