title: Australian Open
text: The Australian Open is one of the four Grand Slam tennis tournaments. It is the first one of the year. It is played in Melbourne, Australia. The Australian Open has been played on three different surfaces:
  Grass (1905–1987)
  Rebound Ace (a type of hard court, 1988–2007)
  Plexicushion (a faster type of hard court, (2008–present)
  
  Before 1983, many of the best tennis players did not play at the tournament. This was because the Australian Open was far away from Europe and North America and was not considered as important as the other Grand Slam tournaments.
  
  Heat policy
  The tournament is played in January, during the Australian summer. In 1998 an extreme heat rule was brought in. It is the only major tournament that has a heat policy. If the temperature gets higher than 35 degrees (C) matches may have to be stopped for a short time, because players feel dehydrated. Matches on the outside courts are stopped. The roof over the main stadium courts can be closed, and cooling systems turned on. In 2007 the temperature on the courts reached 50 degrees Celsius.
  
  Winners
  2022 Rafael Nadal and Ashleigh Barty
  2021 Novak Djokovic and Naomi Osaka
   2020 Novak Djokovic and Sofia Kenin
   2019 Novak Djokovic and Naomi Osaka
   2018 Roger Federer and Caroline Wozniacki
   2017 Roger Federer and Serena Williams
   2016 Novak Djokovic and Angelique Kerber
   2015 Novak Djokovic and Serena Williams
   2014 Stan Wawrinka and Li Na
   2013 Novak Djokovic and Victoria Azarenka
   2012 Novak Djokovic and Victoria Azarenka
   2011 Novak Djokovic and Kim Clijsters
   2010 Roger Federer and Serena Williams
   2009 Rafael Nadal and Serena Williams
   2008 Novak Djokovic and Maria Sharapova 
   2007 Roger Federer and Serena Williams
   2006 Roger Federer and Amélie Mauresmo 
   2005 Marat Safin and Serena Williams
   2004 Roger Federer and Justine Henin-Hardenne
  
  References
  
  Other websites
   Australian Open website
  
  Tennis tournaments in Australia
  Grand Slam tennis tournaments
  1905 establishments
  1900s establishments in Australia