Marcos Ondruska has a competitive hard court record of 74–86 across 160 matches (46.3%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Marcos Ondruska has reached 2 finals without yet claiming a title on hard — one of the finest margins in tennis.

At Grand Slam level (Australian Open & US Open): Marcos Ondruska is 11–15 (42.3%) across 26 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

ATP Masters 1000 on hard (Indian Wells, Miami, Canada, Cincinnati, Shanghai, Paris): a positive 14–14 (50.0%) across 28 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on hard.

2 finals reached on hard — none converted into a title yet. Reaching 2 finals is a mark of real quality, but the gap between finalist and champion is one of the finest lines in the sport. 4 semifinals. 10 quarterfinals.

vs. Top 10 on hard: 4–17 (19.0%, 21 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: 16–18 (47.1%); best-of-three: 58–68 (46.0%). Consistent regardless of format on hard — a sign of a well-rounded game that holds up as matches develop.

Best season: 1994 — 13–9 (59.1%) from 22 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.