Shuzo Matsuoka has found clay courts difficult, recording 8–18 across 26 matches (30.8%). 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): Shuzo Matsuoka has struggled at Grand Slam level on clay: 2–4 (33.3%) in 6 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

By format on clay — best-of-five: 3–6 (33.3%); best-of-three: 5–12 (29.4%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Best season: 1993 — 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.