Eduardo Masso has found clay courts difficult, recording 24–32 across 56 matches (42.9%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Eduardo Masso has reached 1 final without yet claiming a title on clay — one of the finest margins in tennis.

At Grand Slam level (Roland Garros): Eduardo Masso has struggled at Grand Slam level on clay: 1–4 (20.0%) in 5 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

One final reached on clay, without converting it into a title. That final-round experience is valuable groundwork for going one step further next time. 3 semifinals. 5 quarterfinals.

By format on clay — best-of-five: 6–5 (54.5%); best-of-three: 18–27 (40.0%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 1990 — 8–4 (66.7%) from 12 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.