Yan Bai has found hard courts difficult, recording 5–8 across 13 matches (38.5%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar.

ATP Masters 1000 on hard (Indian Wells, Miami, Canada, Cincinnati, Shanghai, Paris): Yan Bai has struggled at Masters level on hard: 1–2 (33.3%) in 3 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

By format on hard — best-of-five: 3–1 (75.0%); best-of-three: 2–7 (22.2%). Significantly better in five-set matches — a strong physical profile on hard that tends to tell as matches and tournaments progress.

Best season: 2008 — 3–2 (60.0%) from 5 matches. The best single-season display to date — a useful reference point as the hard record continues to develop.