Deon Joubert has found grass courts difficult, recording 2–5 across 7 matches (28.6%). 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 (Wimbledon): Deon Joubert 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 grass — best-of-five: 2–2 (50.0%); best-of-three: 0–3 (0.0%). Significantly better in five-set matches — a strong physical profile on grass that tends to tell as matches and tournaments progress.