Rui Machado has found clay courts difficult, recording 24–32 across 56 matches (42.9%). 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): Rui Machado 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.

By format on clay — best-of-five: 10–7 (58.8%); best-of-three: 14–25 (35.9%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 2010 — 6–3 (66.7%) from 9 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.