John Bartlett has found grass courts difficult, recording 27–39 across 66 matches (40.9%). 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 Bartlett has struggled at Grand Slam level on grass: 3–13 (18.8%) in 16 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

By format on grass — best-of-five: 6–16 (27.3%); best-of-three: 21–23 (47.7%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on grass.

Best season: 1968 — 5–4 (55.6%) from 9 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.