Luiz Mattar has a competitive clay court record of 81–83 across 164 matches (49.4%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Claimed 1 title on clay: Coral Springs.

At Grand Slam level (Roland Garros): Luiz Mattar is 6–9 (40.0%) across 15 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): Luiz Mattar is 5–9 (35.7%) across 14 Masters matches — below .500 in the Tour's deepest fields. Lifting that record here would unlock better results across the whole clay swing.

One final reached on clay, converted into a title — a perfect finals record on this surface. 5 semifinals. 16 quarterfinals.

vs. Top 10 on clay: 2–10 (16.7%, 12 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: 15–15 (50.0%); best-of-three: 66–68 (49.3%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Best season: 1994 — 10–8 (55.6%) from 18 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.