Jun Kamiwazumi has a competitive clay court record of 40–48 across 88 matches (45.5%). The record shows a player capable of competing here, though there is clear room to push the win rate higher.

At Grand Slam level (Roland Garros): Jun Kamiwazumi has struggled at Grand Slam level on clay: 3–6 (33.3%) in 9 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

5 quarterfinals on clay, including one run to the semifinal — regularly reaching that stage is a solid baseline, with the next step being to break through to the final rounds more often.

vs. Top 10 on clay: 2–2 (50.0%, 4 matches). Competitive against the elite, but still narrowly below .500 — closing that gap would directly elevate the overall clay court profile.

By format on clay — best-of-five: 0–6 (0.0%); best-of-three: 40–42 (48.8%). 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: 1971 — 4–2 (66.7%) from 6 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.