Frederik Nielsen

Frederik Løchte Nielsen (born 27 August 1983) is a Danish tennis coach and a former professional player. A Wimbledon men's doubles champion, he peaked at world No. 17 in the rankings in April 2013. Nielsen reached five other doubles finals on the ATP Tour, winning two more titles.

Having turned professional in 2001, Nielsen began competing on the ITF circuit, winning a singles title every year between 2005 and 2010. He continued to play in ITF and ATP Challenger tournaments, garnering considerable success on the doubles circuit where he won multiple titles during the period.

Nielsen made a transition on to the main ATP Tour in 2012. He represented Denmark at the Hopman Cup that year, playing a few keenly contested matches against top-ranked opponents including Tomas Berdych and Mardy Fish, while also winning in doubles with Caroline Wozniacki. Nielsen entered the 2012 Wimbledon Championships with Jonathan Marray as wildcard entrant, but the duo went on to win the tournament upstaging such higher-ranked opponents as the Bryan brothers en route to the title. He became only the second Danish player to ever win a Grand Slam title (following his grandfather Kurt) and the first wildcard entrant to win Wimbledon men's doubles title.

Partnering Johan Brunström, Nielsen reached the finals of the 2012 Moselle Open and the 2013 Heineken Open, before winning his first tour-level title at the 2014 Aircel Chennai Open. He continued to play on the Challenger tour in singles, while enjoying success in doubles on the main ATP circuit, winning again at the 2019 BMW Open.

Nielsen's parents were both tennis players and he picked up the sport at the age of three. Nielsen is the grandson of Kurt Nielsen, a former Danish tennis player and two-time Wimbledon finalist and a Mixed Doubles champion at the 1957 U.S. National Championships.

Nielsen made his ATP singles debut in 2003 Copenhagen as a wildcard, losing to Magnus Larsson in the first round. He made his Davis Cup debut in the Europe/Africa Zone Group II tie against Tunisia at Hillerod, Denmark and defeated Malek Jaziri 6–1, 6–4 in the dead rubber, Denmark winning 4–1. Nielsen also won the singles title at the Futures event in Vietnam.

In 2004, Nielsen teamed with countryman Rasmus Nørby to win 5 Futures doubles titles. Reached 1 Futures Singles final. He won 1 doubles Futures title and 2 titles in 4 Futures singles finals in 2005. In 2006, he won doubles title at 2 Challengers and 7 Futures. Also won 3 Futures singles titles.

In 2007, Nielsen won doubles titles at 3 Challengers and Futures. 2-time singles winner at Futures. In 2008, Nielsen won 2 doubles Challengers and 1 Futures, all three with different partners. In 2009, he won 3 Challengers tournaments in doubles and 1 Futures title in singles.