Onny Parun has a competitive hard court record of 76–80 across 156 matches (48.7%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Claimed 2 titles on hard: Jakarta, Johannesburg WCT.

At Grand Slam level (Australian Open & US Open): Onny Parun has yet to record a win on hard at this stage — 0–2 across 2 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.

3 finals reached on hard — won 2, lost 1 (solid 67% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on hard. 9 semifinals. 16 quarterfinals.

vs. Top 10 on hard: 2–11 (15.4%, 13 matches). Top 10 opponents have represented a clear ceiling on hard; addressing that deficit is the single biggest lever for improving the overall record here.

By format on hard — best-of-five: 4–6 (40.0%); best-of-three: 72–74 (49.3%). 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: 1975 — 12–4 (75.0%) from 16 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.

Onny Parun put together an impressive 12-match winning streak on hard, highlighting the ability to maintain high performance across multiple tournament rounds and events.