FC Dallas signed Mauro Diaz on a free transfer on July 17, 2013
2012-2013:Joined FC Dallas in July, made his debut on Aug. 3 at Seattle… Scored a goal in his first start for FC Dallas at Portland on Aug. 17… Had a goal and an assist versus Vancouver on Sept. 7… Had his second goal-and-assist game against Columbus on Sept. 29… Totaled three goals and two assists in 423 minutes… Returned to River Plate following a loan to Unión Española, started twice for the 34-time champions of the Argentine first division during the 2013 Torneo Inicial…Appeared in 41 matches while on loan to Unión Española, 26 of which were starts, for a total 2,267 minutes of action... Scored five goals and had seven assists as a 22-year-old.
2008-2012: Díaz made his debut for famed Argentine side River Plate as a 17-year-old on Sept. 21, 2008. The attacking midfielder scored three goals in 53 appearances for the Argentine first division team before being loaned to Chilean first division side Unión Española for the 2012 season. While with Unión Española, Díaz played a total of 41 matches, 26 of which were starts, for a total 2,267 minutes of action. The 22-year-old scored five goals and had seven assists during his time in Chile. Díaz returned to River Plate following the loan, starting twice for the 34-time champions of the Argentine first division during the 2013 Torneo Inicial.