Lenny Schloss has found grass courts difficult, recording 8–13 across 21 matches (38.1%). 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): Lenny Schloss has struggled at Grand Slam level on grass: 1–3 (25.0%) in 4 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

By format on grass — best-of-five: 3–7 (30.0%); best-of-three: 5–6 (45.5%). 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 — 3–5 (37.5%) from 8 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.