Ana Schweinsteiger (née Ivanovic; born 6 November 1987) is a Serbian former professional tennis player. She was ranked as the world No. 1 in women's singles by the Women's Tennis Association (WTA) for 12 weeks. Ivanovic won 15 WTA Tour-level singles titles, including a major at the 2008 French Open. She was also the runner-up at the 2007 French Open and the 2008 Australian Open. Ivanovic qualified for the year-end WTA Tour Championships three times, in 2007, 2008 and 2014, and won the year-end WTA Tournament of Champions twice, in 2010 and 2011.

Ivanovic's breakthrough came at the 2004 Zurich Open, where she qualified and was narrowly beaten by Venus Williams in the second round in two tiebreak sets. By the age of 18, Ivanovic had already defeated established players such as Svetlana Kuznetsova, Nadia Petrova, Vera Zvonareva and Amélie Mauresmo. Ivanovic's struggles after winning the 2008 French Open were well documented. After that victory, she was overwhelmed by attention, and was unable to repeat her French Open success, failing to reach a major quarterfinal in her subsequent 17 appearances, and dropping as low as No. 65 in the rankings in July 2010. In 2012, Ivanovic reached her first major quarterfinal since her French Open title at the 2012 US Open, thereby achieving the feat of reaching the quarterfinals at all four majors, and finished with a year-end top 15 ranking for the first time since 2008. In 2014, Ivanovic enjoyed a resurgence, beginning with her victory in the Auckland Open, her first singles title in over two years, before going on to win the Monterrey Open, Aegon Classic and the Pan Pacific Open. She qualified for competition in the WTA Tour Championships and secured a year-end ranking of No. 5, signifying her return to the world's elite. In 2015, Ivanovic made it to the semifinals of a major for the first time in seven years at the French Open. In late December 2016, she announced her retirement, citing being no longer able to perform to a high standard as a major factor.

Ivanovic was known for her aggressive style of play and impressive forehand, described by Nadia Petrova as "the best out there." She earned over $15.5 million in prize money, which is the 39th-highest in the all-time rankings. In June 2011, she was named one of the "30 Legends of Women's Tennis: Past, Present and Future" by Time and was also included on the list of "Top 100 Greatest Players Ever" (male and female combined) by reporter Matthew Cronin.

Ivanovic (Ана Ивановић / Ana Ivanović, pronounced [âna ǐʋanoʋitɕ, ǎː-] ^ⓘ) was born in Belgrade, SFR Yugoslavia. Her mother, Dragana, a lawyer, has been court-side during most of her matches. Her father Miroslav, a self-employed businessman, attended as many events as he possibly could. Ivanovic has a younger brother, Miloš, with whom she loved to play basketball.

Ivanovic began playing tennis at the age of five after watching Monica Seles, a fellow Yugoslav, on television. She started her career after memorizing the telephone number of a local tennis clinic from an advertisement. During the NATO bombing of Yugoslavia, she was forced to train during the morning to avoid bombardments. She trained in an abandoned swimming pool in the winter, as no tennis facilities were available. At 13 she moved to Basel, Switzerland due to the better training facilities and coaching available. Manager Dan Holzmann was living in Basel, and Ana and her mother moved to Switzerland when she signed an agreement with the Swiss entrepreneur.

When she was 15, Ivanovic spent four hours in a locker room crying after a defeat – the first that her new manager had witnessed. She thought that Dan Holzmann would abandon her, thinking she wouldn't be good enough to become a professional tennis player. However, he remained her manager throughout her career.

Ivanovic reached the final of the Junior Wimbledon tournament, losing to Kateryna Bondarenko. In 2004, she went 26–0 on the ITF Women's Circuit, and won all five events that she entered, two of them as a qualifier. As a qualifier in Zurich, she overcame a 5–1 third-set deficit along with two match points to defeat world No. 29 Tatiana Golovin. She then debuted in the qualifying draw of a major at the US Open, where she was defeated by Lioudmila Skavronskaia after winning the first set 6–1 and having two match points in the third set. Her first notable breakthrough occurred in the next tournament, when she took Venus Williams to two tiebreaks, before losing in straight sets in the second round of the Zurich Open. She had held several set points in both sets. She followed up her run in Zurich with a quarterfinal showing at Luxembourg the next week.

As a qualifier, Ivanovic won her first career singles title early in the year at the Canberra International, after defeating Melinda Czink in the final. Her ranking continued to rise after wins over Svetlana Kuznetsova in Miami, Nadia Petrova also in Miami, and Vera Zvonareva in Warsaw, all of whom were top-10 players. Ivanovic lost to Amélie Mauresmo at the Australian Open in the third round, at Doha in the third round after holding a 6–2, 2–0 lead, and at the Miami Masters in the quarterfinals. However, Ivanovic's biggest win to date then came over Mauresmo in the third round of the French Open. She advanced to the quarterfinals of only her second Grand Slam tournament by defeating Francesca Schiavone in the fourth round. Later in the year, Ivanovic reached the semifinals of the Zurich Open and Generali Ladies Linz, losing to Patty Schnyder in both tournaments. She finished the year ranked No. 16.