Janko Tipsarević (Serbian Cyrillic: Јанко Типсаревић, pronounced [jâːŋko tipsǎːreʋitɕ]; born 22 June 1984) is a Serbian tennis coach and former professional player. In tennis, his career-high singles ranking is world No. 8, achieved on 2 April 2012. In his career, he won 4 ATP World Tour titles, one ATP doubles title, three Futures, and 15 Challenger titles. Tipsarević also won the 2001 Australian Open junior title. He holds notable victories over former world No. 1 players Carlos Moyá, Marat Safin, Lleyton Hewitt, Juan Carlos Ferrero, Andy Roddick, his compatriot Novak Djokovic, and Andy Murray. His best results at a Grand Slam tournament were reaching the quarterfinals at the US Open in 2011 and 2012.

Tipsarević was born in Belgrade, Serbia (then SFR Yugoslavia). His father, Pavle, is a professor, and his mother, Vesna, is a housewife. He also has a younger brother, Veljko (Вељко). He finished high school and in 2006 completed his degree in Sports Management at the University of Belgrade.

He began pursuing tennis at age six. At the age of nine, he joined the New Belgrade Tennis Club where he trained under the guidance of Russian coach Roman Savochkin.

As a junior, he won the 2001 Australian Open boys' singles title, achieving the No. 1 ranking the same year (and No. 4 in doubles).

In 2001, as a member of the Yugoslav Davis Cup team he won all three matches against Poland in the Group II quarterfinal, helping the team to a 3–2 win. The following week, he won his first career Futures title in Belgrade. In 2002, he won his second Futures title in Mexico.

After winning his first ATP Challenger tournament in Germany, he made his ATP Tour debut in Indianapolis in 2003. After beating fellow Serb Nenad Zimonjić in the first round, he lost in the second round to Yevgeny Kafelnikov in straight sets. He also made his Grand Slam debut in the US Open as a qualifier. He lost to 20th seed, Mark Philippoussis in the first round. In 2004, as a qualifier, he made his first appearances at the French Open and Wimbledon, losing in the first round of each. Later that year, he won two Challenger titles in singles and one in doubles.

Tipsarević played in 15 ATP tournaments in 2005 and broke into the top 100 for the first time. He also reached the second rounds of the Australian Open and French Open. He lost to Dominik Hrbatý in the Australian Open, but was able to beat him at Roland Garros. He also reached the third round of Wimbledon, beating Tommy Haas and Lu Yen-hsun, but then lost to Thomas Johansson. In doubles, he partnered with Jiří Vaněk to win the Napoli Challenger title. He also reached the quarterfinals with fellow Serb Novak Djokovic in the Croatia Open Umag and the Vietnam Open with Marcos Baghdatis.

He finished 2006 as the No. 2 Serbian tennis player after Djokovic, and he was ranked in the top 100 for the first time at No. 65. He won four Challenger titles, compiling a 31–8 record at that level. On the ATP Tour, he reached the quarterfinals of the Nottingham Open, losing to Robin Söderling from Sweden.