Simon Greul has found hard courts difficult, recording 20–32 across 52 matches (38.5%). 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): Simon Greul has struggled at Grand Slam level on hard: 1–6 (14.3%) in 7 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

ATP Masters 1000 on hard (Indian Wells, Miami, Canada, Cincinnati, Shanghai, Paris): a positive 6–4 (60.0%) across 10 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on hard.

vs. Top 10 on hard: 0–4 (0.0%, 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: 2–6 (25.0%); best-of-three: 18–26 (40.9%). 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: 2006 — 6–7 (46.2%) from 13 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.