Cash leads charge

Of the men and women who played singles in the fourth round Sunday, all came from the Old World, with the accent on the eastern reaches of the continent. Geographical shifts in power are not uncommon in an individual sport where the emergence of a champion or two can quickly change its complexion.Consider the South American wave, when first Marcelo Rios of Chile and then Gustavo Kuerten of Brazil came to the fore. But the depth of the European presence at Roland Garros this year is unprecedented.