Billy Martin has found clay courts difficult, recording 42–54 across 96 matches (43.8%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar.

At Grand Slam level (Roland Garros): Billy Martin has struggled at Grand Slam level on clay: 5–9 (35.7%) in 14 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

3 semifinals on clay without yet reaching a final — consistent deep runs that show the ability to string together wins across a full draw, with the step to the final still to come. 4 quarterfinals adds further depth to that picture.

vs. Top 10 on clay: 2–12 (14.3%, 14 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: 4–6 (40.0%); best-of-three: 38–48 (44.2%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Best season: 1974 — 5–2 (71.4%) from 7 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.