John Yuill has found grass courts difficult, recording 11–15 across 26 matches (42.3%). 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): John Yuill is 6–9 (40.0%) across 15 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: 6–9 (40.0%); best-of-three: 5–6 (45.5%). Slightly stronger in three-set contests on grass, though the five-set record is still respectable.

Best season: 1973 — 3–2 (60.0%) from 5 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.