Juan Antonio Marin has found hard courts difficult, recording 9–24 across 33 matches (27.3%). 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): Juan Antonio Marin has yet to record a win on hard at this stage — 0–8 across 8 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.

ATP Masters 1000 on hard (Indian Wells, Miami, Canada, Cincinnati, Shanghai, Paris): a positive 2–2 (50.0%) across 4 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on hard.

By format on hard — best-of-five: 5–10 (33.3%); best-of-three: 4–14 (22.2%). Significantly better in five-set matches — a strong physical profile on hard that tends to tell as matches and tournaments progress.

Best season: 1999 — 5–10 (33.3%) from 15 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.