The defending champ survives a tough opener in Shanghai! @rogerfederer hangs on to defeat 🇷🇺Medvedev 6-4, 4-6, 6-4 to set up a clash against 🇪🇸Bautista-Agut at the @rolexshmasters! 📸: 2018 #USOpen. _ #tennis #rogerfederer #shanghai #atpworldtour #shanghairolexmasters #instatennis #instasports