Mark Koevermans has found hard courts difficult, recording 18–23 across 41 matches (43.9%). 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): Mark Koevermans is 4–6 (40.0%) across 10 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

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.

By format on hard — best-of-five: 5–7 (41.7%); best-of-three: 13–16 (44.8%). Slightly stronger in three-set contests on hard, though the five-set record is still respectable.

Best season: 1990 — 8–6 (57.1%) from 14 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.