Lars Jonsson has found clay courts difficult, recording 48–69 across 117 matches (41.0%). 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 (Roland Garros): Lars Jonsson is 4–5 (44.4%) across 9 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): Lars Jonsson has struggled at Masters level on clay: 1–5 (16.7%) in 6 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

2 semifinals on clay without yet reaching a final — consistent deep runs that show the ability to string together wins across a full draw, with the step to the final still to come. 9 quarterfinals adds further depth to that picture.

vs. Top 10 on clay: 0–6 (0.0%, 6 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: 4–5 (44.4%); best-of-three: 44–64 (40.7%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Best season: 1991 — 10–9 (52.6%) from 19 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.