ÃÂscar MartÃÂnez Diéguez (born 9 March 1974) is a tennis coach and a former professional player from Spain.
Martinez made his debut on the ATP Tour at the 1994 Casablanca Open, where he defeated two top 100 players, Carl-Uwe Steeb and Franco DavÃÂn, en route to a quarter-final appearance. He was runner-up in the 1994 Athens International, beating the second and third seeds, before losing the final to Alberto Berasategui. The Spaniard also reached the quarterfinals in Prague that year.
In 1995, Martinez was a quarterfinalist in Mexico City. He had a win that year over world number 13 Alberto Berasategui in Stuttgart's Mercedes Cup and appeared in two Grand Slam tournaments. In the 1995 French Open he was beaten in the first round by Daniel Vacek and in Wimbledon he lost again in the opening round, to Stefan Edberg.