Jacobo Díaz Ruiz (born 11 July 1976) 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.
(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (P#) preliminary round; (DNQ) did not qualify; (A) absent; (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; (G) gold, (S) silver or (B) bronze Olympic/Paralympic medal; (NMS) not a Masters tournament; (NTI) not a Tier I tournament; (P) postponed; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.