Luis Herrera has found clay courts difficult, recording 11–19 across 30 matches (36.7%). 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): Luis Herrera 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: 3–9 (25.0%); best-of-three: 8–10 (44.4%). 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: 1994 — 3–2 (60.0%) from 5 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.