Aki Rahunen has found hard courts difficult, recording 6–16 across 22 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): Aki Rahunen has struggled at Grand Slam level on hard: 1–4 (20.0%) in 5 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): Aki Rahunen has struggled at Masters level on hard: 0–3 (0.0%) in 3 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

By format on hard — best-of-five: 3–5 (37.5%); best-of-three: 3–11 (21.4%). Significantly better in five-set matches — a strong physical profile on hard that tends to tell as matches and tournaments progress.

Best season: 1990 — 3–8 (27.3%) from 11 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.