Horacio de la Pena holds a solid clay court record of 164–134 across 298 matches (55.0%). A winning majority across 298 matches shows consistent ability to get results on clay. 4 titles on clay: Charlotte, Kitzbuhel, Marbella, Florence — a record that reflects consistent ability to close out tournaments on this surface.

At Grand Slam level (Roland Garros): Horacio de la Pena is 10–10 (50.0%) across 20 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 8–6 (57.1%) across 14 matches — winning above .500 at this level, week in week out, is a genuine sign of quality on clay.

5 finals reached on clay — converted 4 into titles (outstanding 80% conversion rate). Converting finals at that rate separates champions from contenders. 13 semifinals. 33 quarterfinals.

vs. Top 10 on clay: 5–15 (25.0%, 20 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: 14–11 (56.0%); best-of-three: 150–123 (54.9%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Peak season: 1988 — 17–8 (68.0%) from 25 matches. That year captures the ceiling of what Horacio de la Pena can do on clay when performing at their best and represents the standard to aim for.