Raemon Sluiter has found hard courts difficult, recording 36–52 across 88 matches (40.9%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Raemon Sluiter has reached 1 final without yet claiming a title on hard — one of the finest margins in tennis.

At Grand Slam level (Australian Open & US Open): Raemon Sluiter has struggled at Grand Slam level on hard: 4–12 (25.0%) in 16 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): Raemon Sluiter 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.

One final reached on hard, without converting it into a title. That final-round experience is valuable groundwork for going one step further next time. 1 semifinal. 6 quarterfinals.

vs. Top 10 on hard: 2–7 (22.2%, 9 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: 6–14 (30.0%); best-of-three: 30–38 (44.1%). 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: 2004 — 11–11 (50.0%) from 22 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.