Karel Novacek holds a solid clay court record of 187–116 across 303 matches (61.7%). A winning majority across 303 matches shows consistent ability to get results on clay. With 10 titles, among the most prolific clay court champions in the Open Era: Munich, Prague, San Marino, Hilversum and 3 more.

At Grand Slam level (Roland Garros): Karel Novacek is 15–12 (55.6%) across 27 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 clay (Monte Carlo, Madrid, Rome): a positive 16–16 (50.0%) across 32 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on clay.

16 finals reached on clay — won 10, lost 6 (solid 63% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on clay. 23 semifinals. 39 quarterfinals.

vs. Top 10 on clay: 10–10 (50.0%, 20 matches). Competitive against the elite, but still narrowly below .500 — closing that gap would directly elevate the overall clay court profile.

By format on clay — best-of-five: 20–13 (60.6%); best-of-three: 167–103 (61.9%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Dominant season: 1991 — 33–10 (76.7%) from 43 matches. A campaign of 33 wins on clay in a single season is among the best single-season records the surface has seen — the clearest benchmark of what is achievable at peak level.