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Nenad Zimonjić (Serbian Cyrillic: Ненад Зимоњић, pronounced [nênaːd zǐmoɲitɕ]; born 4 June 1976) is a Serbian professional tennis player who was ranked world No. 1 in doubles.
He is an eight-time Grand Slam champion, having won the 2008 and 2009 Wimbledon Championships as well as the 2010 French Open in men's doubles partnering Daniel Nestor. In mixed doubles, Zimonjić won the 2004 Australian Open partnering Elena Bovina, the 2006 and 2010 French Opens partnering Katarina Srebotnik, the 2008 Australian Open partnering Sun Tiantian, and the 2014 Wimbledon Championships partnering Samantha Stosur. He has also reached nine further major finals across the two disciplines.
Zimonjić won 54 doubles titles on the ATP Tour, including the 2008 and 2010 Tour Finals, and 15 Masters 1000-level titles. He became the world No. 1 for the first time in November 2008, going on to spend 50 weeks at the top of the rankings over the next two years. Zimonjić was the second Serbian to top the doubles rankings, after Slobodan Živojinović in 1986.
In singles, he reached his career-high ranking of world No. 176 in March 1999, and achieved his best major result at the Wimbledon Championships that year, reaching the third round. Zimonjić represented Serbia in the Davis Cup from 1995 to 2017, competing in 55 ties and earning 43 victories, making him the most successful Davis Cup player in Serbian history. He was also part of the team that won the tournament in 2010, and served as captain from 2017 to 2020, overseeing Serbia's victory at the inaugural ATP Cup in 2020. Zimonjić also competed at the Olympic Games on four occasions.