Frederik Nielsen

In September, he played the Davis Cup Europe/Africa Zone Group II Denmark vs. Moldova tie, winning the first singles rubber and the doubles match but losing the reverse singles, thereby helping promote Denmark to the 2015 Davis Cup Europe/Africa Zone Group I.

Nielsen partnered Johan Brunstrom and they entered the 2014 Aircel Chennai Open in January, the pair did not lose a single set on their route to the finals and went on to win the title defeating Marin Draganja and Mate Pavic 6-2, 4-6, 10-7. This was Nielsen's first title other than Wimbledon.

He then partnered Igor Sijsling for the 2014 Heineken Open and reached the quarters to only go down to the top seeds Alexander Peya and Bruno Soares 5-7, 5-7. He played at the Australian Open alongside Brunstrom and reached the second round before going down to Julien Benneteau and Edouard Roger-Vasselin in a tight three-setter 6-0, 5-7, 3-6.

Partnering Brunstrom, he reached the semis at the 2014 Düsseldorf Open losing out to Martin Emmrich and Christopher Kas 0-6, 5-7. At the 2014 French Open the pair lost in the first round to Spaniards Marcel Granollers and Marc Lopez 5-7, 2-6. They next participated in the Wimbledon Championships falling in the second round.

At the start of 2013, Nielsen partnered Johan Brunstrom for the first time since September 2012 at Metz, they reached the final of 2013 Heineken Open at Auckland losing out to Colin Fleming and Bruno Soares in two tough sets 6-7(1), 6-7(2). Dropped to 1-2 overall in tour-level finals. They lost in the first round of 2013 Australian Open to Simone Bolelli and Fabio Fognini 3-6, 4-6.

Nielsen made a transition on to the main ATP Tour beginning 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 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. He is currently coached by former Danish Davis Cup player Patrik Langvardt.

Nielsen represented Denmark at the 2012 Hopman Cup alongside Caroline Wozniacki, but the pair could not get past the Group Stages. Nielsen had a 1–4 Win-Loss record at the event, 1-1 in doubles and 0-3 in singles. He played much higher ranked opponents in Tomáš Berdych, Grigor Dimitrov and Mardy Fish. He managed to win 1 set against Fish but eventually lost 4-6, 7-6, 6-4. Nielsen and Wozniacki still managed to pull out the doubles match against Fish and Bethanie Mattek-Sands 7-5, 6-3 and won their only tie against USA.

Then Nielsen and Marray received a wild card at the All England Club and began their 2012 Wimbledon Championships with a 5-set win over Marcel Granollers and Marc Lopez, one of 4 teams they beat en route that qualified for Barclays ATP World Tour Finals. In the third-round, they edged out another five set victory this time against Aisam-ul-Haq Qureshi and Jean-Julien Rojer 7-5 in 5th set, followed with victory over James Cerretani and Edouard Roger-Vasselin in the quarters in five sets again. In the Semi-Finals they caused the biggest upset by beating No. 2 seeds Bryans in 4 sets 6-4, 7-6(9), 6-7(4), 7-6(5). In the title clash they defeated the No. 5 seeds Robert Lindstedt and Horia Tecau in 5-sets 4-6, 6-4, 7-6(5), 6-7(5), 6-3. Marray was first British doubles champion at Wimbledon since 1936 and Nielsen was first Dane to win the doubles crown.

Nielsen finished the year as top Danish player in doubles, a year-end best No. 21 individually and No. 9 in ATP Doubles Team Rankings with Marray. He also earned a career-high $334,901 in 2012 courtesy of his win at Wimbledon.

In 2010, Nielsen won 2 Challengers and 3 Futures in Men's doubles. He also won singles Futures event in Italy. The following year, he won 5 Challengers doubles titles with 3 different partners; he was the finalist at 3 other events.

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.

Nielsen had been friends with Jonny Marray since their early days on the senior tour, but had only played together twice before in 2006 and 2008.

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.

Nielsen made his ATP singles debut in Copenhagen, losing to Magnus Larsson in the first round d 6-1, 6-1. In 2003, 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.

Nielsen's parents were both tennis players and he picked up the sport at the age of three. Having turned professional in 2001, he 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.

Frederik Løchte Nielsen (born 27 August 1983) is a professional tennis player. He is currently the top ranked player from Denmark in ATP doubles world rankings. A former Wimbledon men's doubles champion, he peaked at no. 17 in the rankings in April 2013. Nielsen has reached five other doubles finals on tour, winning on two occasions.