Nicolas Massu holds a solid clay court record of 162–119 across 281 matches (57.7%). A winning majority across 281 matches shows consistent ability to get results on clay. 5 titles on clay: Buenos Aires, Palermo, Costa do Sauipe, Amersfoort, Kitzbuhel — a record that reflects consistent ability to close out tournaments on this surface.

At Grand Slam level (Roland Garros): Nicolas Massu is 8–9 (47.1%) across 17 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): Nicolas Massu is 11–13 (45.8%) across 24 Masters matches — below .500 in the Tour's deepest fields. Lifting that record here would unlock better results across the whole clay swing.

13 finals reached on clay — won 5, lost 8 (38% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 16 semifinals. 33 quarterfinals.

vs. Top 10 on clay: 5–13 (27.8%, 18 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: 21–14 (60.0%); best-of-three: 141–105 (57.3%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Peak season: 2003 — 25–10 (71.4%) from 35 matches. That year captures the ceiling of what Nicolas Massu can do on clay when performing at their best and represents the standard to aim for.