Roy Barth has found grass courts difficult, recording 21–26 across 47 matches (44.7%). 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 (Wimbledon): Roy Barth has struggled at Grand Slam level on grass: 6–11 (35.3%) in 17 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

By format on grass — best-of-five: 8–14 (36.4%); best-of-three: 13–12 (52.0%). 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: 1969 — 11–5 (68.8%) from 16 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.

Roy Barth recorded a notable 5-match winning streak on grass — a run that demonstrates consistency across consecutive draws on this surface.