Klaus Eberhard has a competitive clay court record of 42–49 across 91 matches (46.2%). The record shows a player capable of competing here, though there is clear room to push the win rate higher.

At Grand Slam level (Roland Garros): Klaus Eberhard has struggled at Grand Slam level on clay: 3–5 (37.5%) in 8 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

2 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. 8 quarterfinals adds further depth to that picture.

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: 39–42 (48.1%). 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 — 10–9 (52.6%) from 19 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.