Filip Dewulf has a competitive clay court record of 50–49 across 99 matches (50.5%). 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: Kitzbuhel.

At Grand Slam level (Roland Garros): Filip Dewulf has been outstanding — 9–3 (75.0%) across 12 matches. Winning more than 7 in 10 Grand Slam matches on clay is the benchmark of an all-time great on this surface.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): Filip Dewulf has struggled at Masters level on clay: 2–4 (33.3%) in 6 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

One final reached on clay, converted into a title — a perfect finals record on this surface. 4 semifinals. 9 quarterfinals.

vs. Top 10 on clay: 3–4 (42.9%, 7 matches). Competitive against the elite, but still narrowly below .500 — closing that gap would directly elevate the overall clay court profile.

By format on clay — best-of-five: 17–9 (65.4%); best-of-three: 33–40 (45.2%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Peak season: 1997 — 15–7 (68.2%) from 22 matches. That year captures the ceiling of what Filip Dewulf can do on clay when performing at their best and represents the standard to aim for.