Heinz Gunthardt holds a solid clay court record of 113–83 across 196 matches (57.7%). A winning majority across 196 matches shows consistent ability to get results on clay. Claimed 1 title on clay: Gstaad.

At Grand Slam level (Roland Garros): Heinz Gunthardt is 12–9 (57.1%) across 21 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

4 finals reached on clay — won 1, lost 3 (25% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 9 semifinals. 23 quarterfinals.

vs. Top 10 on clay: 1–15 (6.3%, 16 matches). Top 10 opponents have represented a clear ceiling on clay; addressing that deficit is the single biggest lever for improving the overall record here.

By format on clay — best-of-five: 20–15 (57.1%); best-of-three: 93–68 (57.8%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Peak season: 1983 — 22–10 (68.8%) from 32 matches. That year captures the ceiling of what Heinz Gunthardt can do on clay when performing at their best and represents the standard to aim for.