Jacobo Diaz has found clay courts difficult, recording 25–42 across 67 matches (37.3%). 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 (Roland Garros): Jacobo Diaz is 2–3 (40.0%) across 5 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): a positive 5–3 (62.5%) across 8 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on clay.

vs. Top 10 on clay: 1–4 (20.0%, 5 matches). Top 10 opponents have represented a clear ceiling on clay; addressing that deficit is the single biggest lever for improving the overall record here.

By format on clay — best-of-five: 2–3 (40.0%); best-of-three: 23–39 (37.1%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Best season: 1998 — 7–7 (50.0%) from 14 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.