David Ferrer Ern (born April 2, 1982 in Jávea/Xàbia) is a Spanish professional tennis player who lives in Valencia, Spain. He turned professional in 2000. Ferrer is known as a particularly dangerous clay court player, though he has had several respectable results on hard courts as well, especially his back-to-back semi-final appearances at the NASDAQ-100 Open in 2005–2006 and his semi-final appearance at the 2007 US Open. He broke into the top 10 in the ATP Tour singles rankings for the first time in 2006. His highest ranking to date is World No. 4, which he reached on February 25, 2008.

Ferrer moved to Gandia at age 13, followed two years later by a move to Barcelona to attend the Catalan Tennis Federation. He spent nine months at Equelite, Juan Carlos Ferrero's Academy in Villena before moving back to Jávea while practicing in Denia. He turned professional in 2000, finishing as World No. 419, winning in Poland F1 and Spain F3 finishing runner-up in Spain F1. 2001 was not a particularly good year for him. He captured his first career Challenger title in Sopot and reached the SF at Manerbio the following week. He also reached the semifinals in Spain F15 and Spain F16.

He played consistently in ATP (10-6) and Challenger (35-13) tournaments, winning his first ATP title in Bucharest (defeated Acasuso) and reaching his first ATP final in just his second ATP event in Umag (defeated Nalbandian, Coria, lost to Moyà). He won Challenger titles in Napoli, Valencia and Sassuolo. All 10 ATP match wins and 34 of 35 Challenger wins came on clay.