Jacobo Díaz
Jacobo Díaz Ruiz is a former professional male tennis player from Spain who retired in 2004. He had a promising juniors career, highlighted by the victory at Roland Garros in 1994. The right-handed player's career-high ATP Entry ranking was World No. 68, achieved in June 2001.
ATP Challenger and ITF Futures finals
Singles: 9 (5–4)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Tampere, Finland | Challenger | Clay |  dts|Apr 1999 |