Diego Junqueira has found clay courts difficult, recording 9–26 across 35 matches (25.7%). 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): Diego Junqueira 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.

By format on clay — best-of-five: 2–2 (50.0%); best-of-three: 7–24 (22.6%). Significantly better in five-set matches — a strong physical profile on clay that tends to tell as matches and tournaments progress.

Best season: 2011 — 2–3 (40.0%) from 5 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.