The 1920 Australasian Championships was a tennis tournament that took place on outdoor Grass courts at the Adelaide Oval, Adelaide, Australia, from 15 March to 20 March. It was the 13th edition of the Australian Championships, the 2nd held in Adelaide, and the first Grand Slam tournament of the season. The singles titles was won by Australian Pat O'Hara Wood. Australian Open 1920: March 15–20, 1920 at Adelaide Oval. Men's singles: Pat O'Hara Wood. Wiki link