<Tr> <Td> </Td> <Td> Other </Td> <Td> E.g. modular systems (tiles), wood, canvas </Td> </Tr> <P> Clay courts are made of crushed shale, stone or brick . The French Open is the only Grand Slam tournament to use clay courts . </P> <P> Clay courts slow down the ball and produce a high bounce in comparison to grass or hard courts . For this reason, the clay court takes away many of the advantages of big serves, which makes it hard for serve - based players to dominate on the surface . Clay courts are cheaper to construct than other types of tennis courts, but a clay surface costs more to maintain . Clay courts need to be rolled to preserve flatness . The clay's water content must be balanced; green clay courts generally require the courts to be sloped to allow water run - off . </P> <P> Clay courts are more common in Europe and Latin America than in North America, and tend to heavily favour baseline players . </P>

How many sq ft is half a basketball court