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Australian Open (Australia? Open? Tennis? The tournament is one of the four Grand Slam tennis events, referred to as the "Australian Open", and it is the first one to appear in the four Grand Slam events every year. It is usually held in Melbourne, Australia's second largest city, in the last two weeks of January every year. Since the establishment of 1905, the Australian Open has gone through the history of 100 years. However, compared with other 34 grand slam events, the Australian Open is still the youngest. The tournament is currently sponsored by the Australian Tennis Association (Tennis? Australia) hosted.