Guillermo Perez-Roldan has an impressive clay court record of 234–120 across 354 matches (66.1% — strong). A win rate of that calibre over 354 matches is a reliable indicator of genuine quality on this surface. 9 titles on clay: San Marino, Casablanca, Munich, Athens, Buenos Aires, Palermo — a record that reflects consistent ability to close out tournaments on this surface.

At Grand Slam level (Roland Garros): Guillermo Perez-Roldan is 10–8 (55.6%) across 18 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): Guillermo Perez-Roldan is 10–11 (47.6%) across 21 Masters matches — below .500 in the Tour's deepest fields. Lifting that record here would unlock better results across the whole clay swing.

21 finals reached on clay — won 9, lost 12 (43% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 36 semifinals. 59 quarterfinals.

vs. Top 10 on clay: 7–16 (30.4%, 23 matches). Top 10 opponents have represented a clear ceiling on clay; addressing that deficit is the single biggest lever for improving the overall record here.

By format on clay — best-of-five: 12–16 (42.9%); best-of-three: 222–104 (68.1%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on clay.

Dominant season: 1987 — 40–14 (74.1%) from 54 matches. A campaign of 40 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.