Harold Solomon has an impressive clay court record of 290–130 across 420 matches (69.0% — strong). A win rate of that calibre over 420 matches is a reliable indicator of genuine quality on this surface. 8 titles on clay: Washington-2, Houston WCT, Louisville, Brussels, Cincinnati, North Conway, Hamburg — a record that reflects consistent ability to close out tournaments on this surface.

At Grand Slam level (Roland Garros): Harold Solomon has been outstanding — 43–15 (74.1%) across 58 matches. Winning more than 7 in 10 Grand Slam matches on clay is the benchmark of an all-time great on this surface.

17 finals reached on clay — won 8, lost 9 (47% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 37 semifinals. 57 quarterfinals.

vs. Top 10 on clay: 18–34 (34.6%, 52 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: 42–25 (62.7%); best-of-three: 248–105 (70.3%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Dominant season: 1977 — 42–11 (79.2%) from 53 matches. A campaign of 42 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.