Serena Williams of the US (R) shakes hands as she celebrates after victory in her women's singles final match against Russia's Maria Sharapova (L) on day thirteen of the 2015 Australian Open tennis tournament in Melbourne on January 31, 2015. AFP PHOTO / MAL FAIRCLOUGH -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo credit should read MAL FAIRCLOUGH/AFP/Getty Images)
