Oscar Hernandez has found hard courts difficult, recording 5–32 across 37 matches (13.5%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar.

At Grand Slam level (Australian Open & US Open): Oscar Hernandez has struggled at Grand Slam level on hard: 1–11 (8.3%) in 12 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

ATP Masters 1000 on hard (Indian Wells, Miami, Canada, Cincinnati, Shanghai, Paris): Oscar Hernandez has struggled at Masters level on hard: 1–7 (12.5%) in 8 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

vs. Top 10 on hard: 0–3 (0.0%, 3 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: 1–11 (8.3%); best-of-three: 4–21 (16.0%). Slightly stronger in three-set contests on hard, though the five-set record is still respectable.

Best season: 2008 — 4–8 (33.3%) from 12 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.