Diego Ayala (born April 29, 1979) is a former professional tennis player from the United States.
Born in Argentina, Ayala grew up in southern Florida and competed for the University of Miami in college tennis.
As a young player on the junior circuit he had a win over Roger Federer, at the 1997 Coffee Bowl competition.
Ayala turned professional in 1998 and played most of his top level tennis in the doubles format, in which he reached as high as 100 in the world.
At the 2003 RCA Championships in Indianapolis he made the first and only final of his ATP Tour career. He and Robby Ginepri defeated the second and third seeded pairings en route to the final, where they faced Mario AnÃÂiàand Andy Ram. Ayala and Ginepri took the first set, then lost the second in a tiebreak, before losing a close final 5âÂÂ7 in the third set. He also made it into the singles main draw, as a qualifier.
In 2004 he featured in the men's doubles at the Wimbledon Championships with Brian Vahaly, as lucky losers. The pair were beaten in the first round by David à  koch and ÃÂlex López Morón.
He won a total of three Challenger titles, all in doubles.
Ayala has coached Robby Ginepri and Jelena JankoviÃÂ. He worked with Eugenie Bouchard at the 2005 Australian Open where she reached the quarter-finals. His association with Bouchard had begun when she was a junior and Ayala coached her at the Saviano Academy.