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.
https://en.wikipedia.org/wiki/Frederik_Nielsen