Ricki Osterthun has a competitive clay court record of 46–46 across 92 matches (50.0%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Claimed 1 title on clay: Hilversum.

At Grand Slam level (Roland Garros): Ricki Osterthun is 4–3 (57.1%) across 7 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

2 finals reached on clay — won 1, lost 1 (solid 50% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on clay. 2 semifinals. 4 quarterfinals.

vs. Top 10 on clay: 1–5 (16.7%, 6 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: 5–3 (62.5%); best-of-three: 41–43 (48.8%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 1985 — 7–5 (58.3%) from 12 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.