Security stepped up at Shanghai Masters in China . The chilling message on a Federer fan website under the name of 'Blue Cat Polytheistic Religion Founder O7 had read . The tournament was suspended for a day after the attack and resumed on Monday. Federer makes public appearances Saturday despite threat . Bidding to protect No.1 ranking from Novak Djokovic .
Security stepped up at Shanghai Masters in China . The tournament was suspended for a day after the attack and resumed on Monday. Federer makes public appearances Saturday despite threat . Bidding to protect No.1 ranking from Novak Djokovic .