The 2009 Australian Open was a tennis tournament played on outdoor hard courts. It was the 97th edition of the Australian Open, and the first Grand Slam event of the year. It took place at the Melbourne Park in Melbourne, Australia, from 19 January through 1 February 2009. The tournament is remembered for containing many notable matches of the 2009 year, including the Nadal v Verdasco semi final and the Nadal v Federer final. It was the first hard court Grand Slam in which Nadal made the final or won.

Melbourne Park is a sports venue in the Melbourne Sports and Entertainment Precinct in Melbourne, Victoria, Australia. Since 1988, Australia's bicentenary, Melbourne Park has been home of the Australian Open Grand Slam tennis tournament played annually in January. The park has multiple venues where the Australian Open matches take place. Rod Laver Arena is the largest venue with a capacity of 15,000, while John Cain Arena seats 10,500 and Margaret Court Arena 7,500. The three venues feature retractable roofs, allowing events to be played indoors or outdoors. Besides, there is the Show Court 3 and 1573 Arena which both have a 3,000 seating capacity, and the new 5000-seat Kia Arena. In total there are 35 outdoor Greenset tennis courts at Melbourne Park.