John Feaver has found clay courts difficult, recording 28–65 across 93 matches (30.1%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. John Feaver has reached 1 final without yet claiming a title on clay — one of the finest margins in tennis.

At Grand Slam level (Roland Garros): John Feaver has struggled at Grand Slam level on clay: 3–9 (25.0%) in 12 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

One final reached on clay, without converting it into a title. That final-round experience is valuable groundwork for going one step further next time. 1 semifinal. 4 quarterfinals.

vs. Top 10 on clay: 0–3 (0.0%, 3 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: 0–8 (0.0%); best-of-three: 28–57 (32.9%). 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: 1977 — 12–12 (50.0%) from 24 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.