Thomaz Koch holds a solid clay court record of 83–60 across 143 matches (58.0%). A winning majority across 143 matches shows consistent ability to get results on clay. Claimed 2 titles on clay: Mexico City, Washington.

At Grand Slam level (Roland Garros): Thomaz Koch is 8–7 (53.3%) across 15 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

2 finals reached on clay — converted 2 into titles (outstanding 100% conversion rate). Converting finals at that rate separates champions from contenders. 7 semifinals. 14 quarterfinals.

vs. Top 10 on clay: 2–10 (16.7%, 12 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: 35–26 (57.4%); best-of-three: 48–34 (58.5%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Peak season: 1969 — 18–3 (85.7%) from 21 matches. That year captures the ceiling of what Thomaz Koch can do on clay when performing at their best and represents the standard to aim for.