Onny Parun has a competitive clay court record of 142–138 across 280 matches (50.7%). 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: Bombay.

At Grand Slam level (Roland Garros): Onny Parun is 14–14 (50.0%) across 28 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. 12 semifinals. 24 quarterfinals.

vs. Top 10 on clay: 1–15 (6.3%, 16 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: 17–28 (37.8%); best-of-three: 125–110 (53.2%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on clay.

Dominant season: 1974 — 34–12 (73.9%) from 46 matches. A campaign of 34 wins on clay in a single season is among the best single-season records the surface has seen — the clearest benchmark of what is achievable at peak level.