Clark Graebner has an impressive clay court record of 64–28 across 92 matches (69.6% — strong). A win rate of that calibre over 92 matches is a reliable indicator of genuine quality on this surface. Claimed 2 titles on clay: Milwaukee, Houston.

At Grand Slam level (Roland Garros): Clark Graebner is 2–2 (50.0%) across 4 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 2, lost 2 (solid 50% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on clay. 11 semifinals. 15 quarterfinals.

By format on clay — best-of-five: 16–8 (66.7%); best-of-three: 48–20 (70.6%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Best season: 1968 — 9–2 (81.8%) from 11 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.

Clark Graebner put together an impressive 9-match winning streak on clay, highlighting the ability to maintain high performance across multiple tournament rounds and events.