Gustavo Kuerten has an impressive clay court record of 181–78 across 259 matches (69.9% — strong). A win rate of that calibre over 259 matches is a reliable indicator of genuine quality on this surface. With 14 titles, among the most prolific clay court champions in the Open Era: Mallorca, Santiago, Buenos Aires, Costa do Sauipe and 7 more.

At Grand Slam level (Roland Garros): Gustavo Kuerten has been outstanding — 36–8 (81.8%) across 44 matches. Winning more than 7 in 10 Grand Slam matches on clay is the benchmark of an all-time great on this surface.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): Gustavo Kuerten is elite here — 50–20 (71.4%) across 70 matches. Sustaining that win rate in the Tour's deepest regular-week draws is a defining quality of the very best on this surface.

18 finals reached on clay — converted 14 into titles (outstanding 78% conversion rate). Converting finals at that rate separates champions from contenders. 22 semifinals. 33 quarterfinals.

vs. Top 10 on clay: 16–14 (53.3%, 30 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: 53–16 (76.8%); best-of-three: 128–62 (67.4%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Dominant season: 2001 — 36–3 (92.3%) from 39 matches. A campaign of 36 wins on clay in a single season is among the best single-season records the surface has seen — the clearest benchmark of what is achievable at peak level.

Gustavo Kuerten assembled a remarkable 29-match winning streak on clay — a run of that length goes far beyond form and into a different level of dominance on this surface.