John James has a competitive grass court record of 44–47 across 91 matches (48.4%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. John James has reached 1 final without yet claiming a title on grass — one of the finest margins in tennis.

At Grand Slam level (Wimbledon): John James has struggled at Grand Slam level on grass: 7–18 (28.0%) in 25 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

One final reached on grass, without converting it into a title. That final-round experience is valuable groundwork for going one step further next time. 3 semifinals. 8 quarterfinals.

vs. Top 10 on grass: 1–3 (25.0%, 4 matches). Top 10 opponents have represented a clear ceiling on grass; addressing that deficit is the single biggest lever for improving the overall record here.

By format on grass — best-of-five: 11–21 (34.4%); best-of-three: 33–26 (55.9%). 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: 1972 — 8–4 (66.7%) from 12 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.