Cassio Motta has found clay courts difficult, recording 63–100 across 163 matches (38.7%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar.

At Grand Slam level (Roland Garros): Cassio Motta is 10–13 (43.5%) across 23 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

8 quarterfinals on clay — 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: 0–13 (0.0%, 13 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: 17–24 (41.5%); best-of-three: 46–76 (37.7%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Best season: 1986 — 7–5 (58.3%) from 12 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.