Frank Gebert has found clay courts difficult, recording 26–46 across 72 matches (36.1%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Frank Gebert has reached 1 final without yet claiming a title on clay — one of the finest margins in tennis.

At Grand Slam level (Roland Garros): Frank Gebert has struggled at Grand Slam level on clay: 2–4 (33.3%) in 6 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. 3 semifinals. 5 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: 3–7 (30.0%); best-of-three: 23–39 (37.1%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Best season: 1977 — 12–17 (41.4%) from 29 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.