Daniel Altmaier has found clay courts difficult, recording 37–50 across 87 matches (42.5%). 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): a positive 9–5 (64.3%) across 14 matches — a player who generally rises to the occasion at the Slams on clay.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): Daniel Altmaier is 9–11 (45.0%) across 20 Masters matches — below .500 in the Tour's deepest fields. Lifting that record here would unlock better results across the whole clay swing.

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. 6 quarterfinals adds further depth to that picture.

vs. Top 10 on clay: 5–5 (50.0%, 10 matches). Competitive against the elite, but still narrowly below .500 — closing that gap would directly elevate the overall clay court profile.

By format on clay — best-of-five: 9–5 (64.3%); best-of-three: 28–45 (38.4%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 2023 — 11–8 (57.9%) from 19 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.

Recent Form 2026: 6–8 (42.9%) on clay. Last 10: L L W L L W L W W L — mixed results, some inconsistency in the current period.