Ruben Ramirez Hidalgo has found clay courts difficult, recording 61–94 across 155 matches (39.4%). 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): Ruben Ramirez Hidalgo is 4–5 (44.4%) across 9 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 3–3 (50.0%) across 6 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on clay.

5 semifinals on clay without yet reaching a final — consistent deep runs that show the ability to string together wins across a full draw, with the step to the final still to come. 14 quarterfinals adds further depth to that picture.

vs. Top 10 on clay: 2–6 (25.0%, 8 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: 4–5 (44.4%); best-of-three: 57–89 (39.0%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Peak season: 2006 — 22–14 (61.1%) from 36 matches. That year captures the ceiling of what Ruben Ramirez Hidalgo can do on clay when performing at their best and represents the standard to aim for.