The ace was seen sporting black 'stickers' on her face, which had many questioning if they were symbolic or a ploy to put her opponent off. It turns out the small strips on her right cheek were medical tape, thought to help keep her sinuses clear and help her breathe properly. The 40-year-old suffers from recurrent sinusitis which, as well as blocking the airways, can lead to headaches, pressure and pain in the face. Prime Minister Boris Johnson is also thought to suffer from the condition and had surgery to clear his sinuses last week. Williams was also seen wearing...