John Fitzgerald has found clay courts difficult, recording 10–26 across 36 matches (27.8%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Claimed 1 title on clay: Kitzbuhel.

At Grand Slam level (Roland Garros): John Fitzgerald has struggled at Grand Slam level on clay: 2–8 (20.0%) in 10 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

One final reached on clay, converted into a title — a perfect finals record on this surface. 1 semifinal. 2 quarterfinals.

vs. Top 10 on clay: 1–4 (20.0%, 5 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: 2–8 (20.0%); best-of-three: 8–18 (30.8%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on clay.

Best season: 1981 — 8–6 (57.1%) from 14 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.

John Fitzgerald recorded a notable 5-match winning streak on clay — a run that demonstrates consistency across consecutive draws on this surface.