Buster C. Mottram has an impressive clay court record of 160–81 across 241 matches (66.4% — strong). A win rate of that calibre over 241 matches is a reliable indicator of genuine quality on this surface. Claimed 1 title on clay: Palma.

At Grand Slam level (Roland Garros): a positive 10–7 (58.8%) across 17 matches — a player who generally rises to the occasion at the Slams on clay.

4 finals reached on clay — won 1, lost 3 (25% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 15 semifinals. 31 quarterfinals.

vs. Top 10 on clay: 2–21 (8.7%, 23 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: 22–12 (64.7%); best-of-three: 138–69 (66.7%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Dominant season: 1976 — 35–13 (72.9%) from 48 matches. A campaign of 35 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.