An ailing Novak Djokovic was knocked out of the Shanghai Masters semifinals on Saturday by world number 204 Valentin Vacherot. The 26-year-old qualifier from Monaco beat Djokovic 6-3, 6-4 to deny him a record-extending fifth title in Shanghai. READ: Djokovic pushes through to Shanghai Masters quarterfinals A hobbling Djokovic, 38, threw up courtside and received









