<Tr> <Th_colspan="2"> Last Completed </Th> </Tr> <Tr> <Td_colspan="2"> 2017 Wimbledon </Td> </Tr> <P> The Championships, Wimbledon, commonly known simply as Wimbledon, is the oldest tennis tournament in the world, and is widely regarded as the most prestigious . It has been held at the All England Club in Wimbledon, London, since 1877 and is played on outdoor grass courts . </P> <P> Wimbledon is one of the four Grand Slam tennis tournaments, the others being the Australian Open, the French Open and the US Open . Since the Australian Open shifted to hardcourt in 1988, Wimbledon is the only major still played on grass . </P>

What type of surface is the all-england championships at wimbledon played on