Horst Skoff holds a solid clay court record of 178–123 across 301 matches (59.1%). A winning majority across 301 matches shows consistent ability to get results on clay. Claimed 3 titles on clay: Geneva, Bastad, Athens.

At Grand Slam level (Roland Garros): Horst Skoff has struggled at Grand Slam level on clay: 3–6 (33.3%) in 9 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): a positive 14–11 (56.0%) across 25 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on clay.

9 finals reached on clay — won 3, lost 6 (33% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 20 semifinals. 35 quarterfinals.

vs. Top 10 on clay: 7–16 (30.4%, 23 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: 13–15 (46.4%); best-of-three: 165–108 (60.4%). 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: 1986 — 14–4 (77.8%) from 18 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.