Venus and Serena Williams continue to aggravate some tennis fans with their perceived selfishness. Last week, the sisters pulled out of the important Federation Cup (the Davis Cup for women) final between the US and Italy, leaving teen sweetheart Melanie Oudin as the featured American player this weekend in Reggio Calabria. Moles say Venus was shooting a commercial in Miami, while Serena (above) was starring in an ad in Manhattan. Serena might still be smarting over the huge fine (said to be $300,000) from her US Open meltdown.