Jan Vacek has a competitive grass court record of 14–15 across 29 matches (48.3%). The record shows a player capable of competing here, though there is clear room to push the win rate higher.

At Grand Slam level (Wimbledon): Jan Vacek is 3–3 (50.0%) across 6 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

By format on grass — best-of-five: 3–3 (50.0%); best-of-three: 11–12 (47.8%). Slightly better in five-set matches on grass — a positive sign for the Slams specifically.

Best season: 2003 — 4–2 (66.7%) from 6 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.