Trevor Allan has found clay courts difficult, recording 23–29 across 52 matches (44.2%). 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): Trevor Allan is 2–2 (50.0%) across 4 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

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. 3 quarterfinals adds further depth to that picture.

By format on clay — best-of-five: 2–2 (50.0%); best-of-three: 21–27 (43.8%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Best season: 1983 — 5–3 (62.5%) from 8 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.