Thierry Guardiola has found hard courts difficult, recording 5–14 across 19 matches (26.3%). 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 (Australian Open & US Open): Thierry Guardiola has struggled at Grand Slam level on hard: 1–3 (25.0%) in 4 matches. The best-of-five format and elite fields make this the toughest benchmark on this surface.

vs. Top 10 on hard: 0–3 (0.0%, 3 matches). Top 10 opponents have represented a clear ceiling on hard; addressing that deficit is the single biggest lever for improving the overall record here.

By format on hard — best-of-five: 1–3 (25.0%); best-of-three: 4–11 (26.7%). Consistent regardless of format on hard — a sign of a well-rounded game that holds up as matches develop.