Juan Ignacio Muntanola has found clay courts difficult, recording 16–26 across 42 matches (38.1%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Juan Ignacio Muntanola has reached 1 final without yet claiming a title on clay — one of the finest margins in tennis.

At Grand Slam level (Roland Garros): Juan Ignacio Muntanola has struggled at Grand Slam level on clay: 1–3 (25.0%) in 4 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

One final reached on clay, without converting it into a title. That final-round experience is valuable groundwork for going one step further next time. 1 semifinal. 2 quarterfinals.

By format on clay — best-of-five: 1–3 (25.0%); best-of-three: 15–23 (39.5%). 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: 1975 — 8–3 (72.7%) from 11 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.