Patricio Cornejo has found grass courts difficult, recording 23–37 across 60 matches (38.3%). 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): Patricio Cornejo has struggled at Grand Slam level on grass: 4–15 (21.1%) in 19 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

By format on grass — best-of-five: 8–16 (33.3%); best-of-three: 15–21 (41.7%). 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 — 9–7 (56.3%) from 16 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.