Frederik Nielsen

Frederik Løchte Nielsen (born 27 August 1983) is a professional male tennis player. He is a former Wimbledon Men's Doubles champion, in 2012, and now competes mainly on the ATP Challenger Tour in both singles and doubles. Nielsen is coached by fellow Dane John Larsen and is a member of the Denmark Davis Cup team. His grandfather is former grand slam finalist Kurt Nielsen.

In 2012, Nielsen won the Wimbledon Men's Doubles Championship with Britain's Jonathan Marray. He thus became the first Dane ever to win a Wimbledon Championship title, his grandfather, Kurt Nielsen, having won the Wimbledon Junior Championship Boys' Singles title in 1947. Nielsen and Marray, who had only played three tournaments together previously, became also the first wildcard pairing to win the Wimbledon Men's Doubles.

Nielsen decided to end his partnership with Marray following the 2012 season in order to concentrate on his singles career. He partnered Grigor Dimitrov at Wimbledon the following year without success, and as a result dropped out of the world doubles top 50. His singles ranking also failed to rise, and to date he has only made the main draw of a grand slam singles event on one occasion. More recently, he has partnered Johan Brunström in tournaments, winning at the Aircel Chennai Open in 2014.