Janko Tipsarević (Serbian Cyrillic: Јанко Типсаревић, Serbian pronunciation: [jâːŋkɔ tipsǎːrɛʋit͡ɕ]) (born 22 June 1984) is a Serbian tennis player. His career-high singles ranking is World No. 8, achieved on 2 April 2012. He is the 117th player in history to crack the top 10.

In his career, he has won two ATP tour championships, two Futures and nine tournaments in the ATP Challenger Series. Tipsarevic has also won the 2001 Australian Open Junior title.

Tipsarević has achieved two victories over a World No. 1 player, having defeated compatriot Novak Djokovic twice. He also has twelwe (12) victories against other players from the top 10, consisting of four wins against Tomáš Berdych, two against Andy Roddick, and one against Fernando González, Mikhail Youzhny, David Ferrer, James Blake, Gaël Monfils, and Andy Murray. He also has wins against former World No. 1 players, Carlos Moyá, Marat Safin, Lleyton Hewitt, and Juan Carlos Ferrero. Arguably his most notable matches to date are his third-round match at the 2008 Australian Open, where he lost to Roger Federer 7–6, 6–7, 7–5, 1–6, 8–10, & reaching the quarter-finals at the 2011 US Open, losing to eventual champion Novak Djokovic in four sets. He has also defeated former top-ten players Andy Roddick and Fernando González at Grand Slam level.

Novak Djokovic (Serbian: Новак Ђоковић or Novak Đoković; pronounced [nɔ̂ʋaːk dʑɔ̂ːkɔʋitɕ] ( listen); born 22 May 1987) is a Serbian professional tennis player who has been ranked World No. 1 by the Association of Tennis Professionals (ATP) since 4 July 2011. He has won five Grand Slam singles titles: the 2008, 2011 and 2012 Australian Open, the 2011 Wimbledon Championships, and the 2011 US Open. By winning three Majors in 2011, Djokovic became the sixth male player in the open era to win three Majors in a calendar year.

He is the first male player representing Serbia to win a Major singles title and the youngest player in the open era to have reached the semifinals of all four Grand Slam events, separately and consecutively. Amongst other titles, he won the Tennis Masters Cup in 2008 and was on the team which won the 2010 Davis Cup. He also won the bronze medal in singles at the Beijing Olympics in 2008. He has won 11 Masters 1000 series titles placing him joint fourth on the all time list. Djokovic has quickly moved up in the rankings of history. Tennis Channel ranked him number 40 , and former player Pat Cash said he is one of the greatest ever.