Jan Hajek has a competitive clay court record of 28–33 across 61 matches (45.9%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Jan Hajek has reached 1 final without yet claiming a title on clay — one of the finest margins in tennis.

At Grand Slam level (Roland Garros): Jan Hajek is 3–4 (42.9%) across 7 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

One final reached on clay, without converting it into a title. That final-round experience is valuable groundwork for going one step further next time. 1 semifinal. 3 quarterfinals.

vs. Top 10 on clay: 0–4 (0.0%, 4 matches). Top 10 opponents have represented a clear ceiling on clay; addressing that deficit is the single biggest lever for improving the overall record here.

By format on clay — best-of-five: 5–4 (55.6%); best-of-three: 23–29 (44.2%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 2012 — 4–3 (57.1%) from 7 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.