MIAMI -- Her in-game grunts may not rise to the piercingly uncomfortable levels of her fellow top-three colleagues, but that doesn't mean Serena Williams isn't trying just as hard. Or harder. For while Victoria Azarenka and Maria Sharapova might sound like they're constantly fighting hard, more often than not, Williams, despite her usually restrained exhalations, really is. You can look it up. According to a telling chart produced by the WTA after her fourth-round comeback against Dominika Cibulkova, Williams leads all active players with a .451 winning percentage (69-84) when she loses the first set of a match. It might not look like much, but that's a remarkable number...
Al Bello/Getty Images