Kristof Vliegen has found grass courts difficult, recording 10–17 across 27 matches (37.0%). 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 (Wimbledon): Kristof Vliegen has struggled at Grand Slam level on grass: 3–6 (33.3%) in 9 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

vs. Top 10 on grass: 0–3 (0.0%, 3 matches). Top 10 opponents have represented a clear ceiling on grass; addressing that deficit is the single biggest lever for improving the overall record here.

By format on grass — best-of-five: 3–6 (33.3%); best-of-three: 7–11 (38.9%). Slightly stronger in three-set contests on grass, though the five-set record is still respectable.

Best season: 2006 — 5–3 (62.5%) from 8 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.