Gilles Simon holds a solid clay court record of 147–119 across 266 matches (55.3%). A winning majority across 266 matches shows consistent ability to get results on clay. 5 titles on clay: Bucharest, Casablanca, Hamburg — a record that reflects consistent ability to close out tournaments on this surface.

At Grand Slam level (Roland Garros): Gilles Simon is 23–17 (57.5%) across 40 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): a positive 40–33 (54.8%) across 73 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on clay.

7 finals reached on clay — won 5, lost 2 (solid 71% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on clay. 13 semifinals. 28 quarterfinals.

vs. Top 10 on clay: 7–25 (21.9%, 32 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: 25–22 (53.2%); best-of-three: 122–97 (55.7%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Best season: 2008 — 12–6 (66.7%) from 18 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.