Andre Agassi was the defending champion, but lost in the second round to Karol Kučera.
Gustavo Kuerten was the defending champion, and successfully defended his title against Àlex Corretja in the final 6–7(3–7), 7–5, 6–2, 6–0.
Jérôme Golmard was the defending champion but lost in the second round to Adrian Voinea.
Richard Krajicek was the defending champion, but lost in the semifinals to Jan Siemerink.
Mark Philippoussis was the defending champion, but lost in the second round this year.
Sara Errani was the defending champion, but Dinara Safina defeated her in the final, 6–7(5–7), 6–1, 7–5.
The 1999 Open Gaz de France – Singles was the singles event of the seventh edition of the Open GDF Suez; a WTA Tier II tournament held in Paris, France. Mary Pierce was the defending champion but did not compete that year.
Roger Federer was the defending champion and successfully defended his title, becoming the first player since Andre Agassi in 1996 to do so. He defeated Mardy Fish in the final 6–7(5–7), 7–6(7–1), 6–4. It was his fourth win at the event; he also won in 2005, 2007 and 2009. It was also Federer's 17th Masters tournament win putting him level with Agassi and his 63rd career title overall, equalling Björn Borg.
Yevgeny Kafelnikov was the defending champion and won in the final 7–6(7–2), 7–6(7–5) against Goran Ivanišević.
The 1999 Australian Open – Mixed Doubles was the mixed doubles event of the eighty-seventh edition of the Australian Open, the first Grand Slam of the year. Venus Williams and Justin Gimelstob were the defending champions but did not compete that year.
Andy Roddick was the defending champion, but he retired from professional tennis in September 2012. Feliciano López won the title beating in the final Gilles Simon, 7–6(7–2), 6–7(5–7), 6–0 for the third title of his career, first since 2010.
Caroline Wozniacki was the defending champion, but she chose not to participate this year.
Agnieszka Radwańska won the title, defeating Anastasia Pavlyuchenkova in the final, 6-7(6-8), 6-3, 6-4
Roger Federer was the defending champion and successfully defended his title, defeating Alejandro Falla in the final, 7–6(7–2), 7–6(7–3).
Angelique Kerber was the defending champion, but she chose not to participate this year.
Tsvetana Pironkova was the defending champion that she had qualified into the main draw, but lost in the semifinals to Petra Kvitová.
Anna-Lena Grönefeld and Jean-Julien Rojer were the defending champions, but lost in the second round to Chan Yung-jan and John Peers.
This was the first edition of the tournament since 2008.
This is the first edition of the tournament.
Dominic Thiem was the defending champion, but chose not to participate this year.
Tomáš Berdych was the two-time defending champion, but withdrew before the competition began.
