Igor Sijsling has found hard courts difficult, recording 30–54 across 84 matches (35.7%). 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): Igor Sijsling has struggled at Grand Slam level on hard: 1–6 (14.3%) in 7 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): Igor Sijsling has struggled at Masters level on hard: 3–7 (30.0%) in 10 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

5 quarterfinals on hard, including one run to the semifinal — regularly reaching that stage is a solid baseline, with the next step being to break through to the final rounds more often.

vs. Top 10 on hard: 1–7 (12.5%, 8 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: 2–7 (22.2%); best-of-three: 28–47 (37.3%). 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: 2012 — 6–7 (46.2%) from 13 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.