Lucas Arnold Ker has found hard courts difficult, recording 3–7 across 10 matches (30.0%). 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): Lucas Arnold Ker is 2–3 (40.0%) across 5 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 hard (Indian Wells, Miami, Canada, Cincinnati, Shanghai, Paris): Lucas Arnold Ker has struggled at Masters level on hard: 1–2 (33.3%) 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: 2–3 (40.0%); best-of-three: 1–4 (20.0%). Significantly better in five-set matches — a strong physical profile on hard that tends to tell as matches and tournaments progress.

Best season: 1998 — 3–5 (37.5%) from 8 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.