Zan Guerry has found clay courts difficult, recording 31–43 across 74 matches (41.9%). 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): Zan Guerry is 3–3 (50.0%) across 6 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

vs. Top 10 on clay: 0–5 (0.0%, 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: 2–3 (40.0%); best-of-three: 29–40 (42.0%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Best season: 1969 — 6–5 (54.5%) from 11 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.