Sebastien De Chaunac has found hard courts difficult, recording 9–18 across 27 matches (33.3%). 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 (Australian Open & US Open): Sebastien De Chaunac has struggled at Grand Slam level on hard: 1–3 (25.0%) in 4 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

vs. Top 10 on hard: 1–3 (25.0%, 4 matches). Top 10 opponents have represented a clear ceiling on hard; addressing that deficit is the single biggest lever for improving the overall record here.

By format on hard — best-of-five: 1–3 (25.0%); best-of-three: 8–15 (34.8%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on hard.

Best season: 2009 — 5–5 (50.0%) from 10 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.