in my opinion,
her australian open best dress : babydoll 2006, and her winning dress in 2008
her french open best dress : 2007, 2008 (honorable mention : pink tutu ballerina 2006, 2012 winning dress, 2009 layer comeback dress) basically i love her FO dress
her wimbledon best dress: 2007 swan dress, 2008 shorts and tuxedo (honorable mention : 2009)
her USO best dress: 2006 black breakfast at tiffany's winning dress, 2007 swarovski red dress (honorable mention: 2012 spiderman night dress, 2009 headband, 2010, 2011 night dress)