M. Lazaro Juncadella defeated Mario Mansilla Diez 2-6 6-2 10-8 in the M15 Castellon 1 q16 on clay. M. Lazaro Juncadella claimed a first win over Mario Mansilla Diez in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-02-03 | M15 Valencia 1 | Q32 | clay | Mario Mansilla Diez | 6-3 6-1 |
| 2024-03-31 | M25 Reus 1 | Q64 | clay | Mario Mansilla Diez | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.