<P> The 2017 Australian Open was a tennis tournament that took place at Melbourne Park between 16--29 January 2017 . It was the 105th edition of the Australian Open, and the first Grand Slam tournament of the year . The tournament consisted of events for professional players in singles, doubles and mixed doubles play . Junior and wheelchair players competed in singles and doubles tournaments . As in previous years, the tournament's title sponsor was Kia . </P> <P> Novak Djokovic and Angelique Kerber were the defending champions and both were unsuccessful in their title defence; they lost to Denis Istomin and Coco Vandeweghe in the second and fourth rounds, respectively . For the first time since the 2004 French Open, both No. 1 seeds lost before the quarterfinals, with both Andy Murray and Kerber defeated in the fourth round . </P> <P> Roger Federer won his eighteenth men's singles Grand Slam title by defeating Rafael Nadal in a five - set final . It was his first major title since 2012 Wimbledon and a rematch of the 2009 Australian Open final, which Nadal won in five sets . Serena Williams overcame her sister Venus in the women's singles final, surpassing Steffi Graf to become the player with the most major wins in the women's game in the Open Era . </P> <P> The 2017 Australian Open was the 105th edition of the tournament and was held at Melbourne Park in Melbourne, Australia . </P>

Who won the australian women's open tennis tournament