The Australian Open is one of the four Grand Slam tennis tournaments to be held each year. It is held each January at Melbourne Park. The tournament was held for the first time in 1905. Like the other three Grand Slam events, it was contested by top-ranked amateur players and known as the Australasian Championships until 1926 then the Australian Championships until the advent of open era in 1968. Originally based at the grass courts at Kooyong in the city of Melbourne's inner south-east, the tournament was in danger of fading into irrelevance before being revived in 1988 with a shift to Melbourne Park (then called Flinders Park), a new (Rebound Ace) hardcourt venue next to the Melbourne Cricket Ground on the southern fringe of the central business district. Mats Wilander was the only player to win the tournament both on grass and on Rebound Ace. However, in 2008, the Rebound Ace surface, which had by then been in place for 20 years, was replaced by a cushioned acrylic surface known as Plexicushion.