Jean-Loup Rouyer has found grass courts difficult, recording 22–31 across 53 matches (41.5%). 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 (Wimbledon): Jean-Loup Rouyer has struggled at Grand Slam level on grass: 4–9 (30.8%) in 13 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

By format on grass — best-of-five: 7–15 (31.8%); best-of-three: 15–16 (48.4%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on grass.

Best season: 1970 — 6–6 (50.0%) from 12 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.