Alex O'Brien has found grass courts difficult, recording 13–18 across 31 matches (41.9%). 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): Alex O'Brien is 4–6 (40.0%) across 10 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

By format on grass — best-of-five: 4–6 (40.0%); best-of-three: 9–12 (42.9%). Slightly stronger in three-set contests on grass, though the five-set record is still respectable.

Best season: 1997 — 5–3 (62.5%) from 8 matches. The best single-season display to date — a useful reference point as the grass record continues to develop.