Tom Okker has an impressive hard court record of 165–73 across 238 matches (69.3% — strong). A win rate of that calibre over 238 matches is a reliable indicator of genuine quality on this surface. 6 titles on hard: Kingston, Johannesburg-1, Atlanta, Chicago-2, Paris, Tel Aviv — a record that reflects consistent ability to close out tournaments on this surface.

At Grand Slam level (Australian Open & US Open): Tom Okker has yet to record a win on hard at this stage — 0–3 across 3 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.

16 finals reached on hard — won 6, lost 10 (38% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 31 semifinals. 47 quarterfinals.

vs. Top 10 on hard: 14–14 (50.0%, 28 matches). Competitive against the elite, but still narrowly below .500 — closing that gap would directly elevate the overall hard court profile.

By format on hard — best-of-five: 22–10 (68.8%); best-of-three: 141–62 (69.5%). Consistent regardless of format on hard — a sign of a well-rounded game that holds up as matches develop.

Peak season: 1973 — 23–5 (82.1%) from 28 matches. That year captures the ceiling of what Tom Okker can do on hard when performing at their best and represents the standard to aim for.