Ricki Osterthun has found hard courts difficult, recording 10–17 across 27 matches (37.0%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Ricki Osterthun has reached 1 final without yet claiming a title on hard — one of the finest margins in tennis.

At Grand Slam level (Australian Open & US Open): Ricki Osterthun has yet to record a win on hard at this stage — 0–3 across 3 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.

One final reached on hard, without converting it into a title. That final-round experience is valuable groundwork for going one step further next time. 1 semifinal. 3 quarterfinals.

By format on hard — best-of-five: 0–5 (0.0%); best-of-three: 10–12 (45.5%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on hard.

Best season: 1987 — 5–8 (38.5%) from 13 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.