Roger Federer Suffers Upset Loss to Grigor Dimitrov in U.S. Open Quarterfinal Tennis by el-admin - September 4, 2019 0832 Roger Federer falls to Grigor Dimitrov in US Open quarterfinal | SI.com Roger Federer Suffers Upset Loss to Grigor Dimitrov in U.S. Open Quarterfinal Modal message Share this: Grigor Dimitrov Plays Improbable Spoiler to Fedal in Epic Upset of Roger FedererDateSeptember 4, 2019In relation toTennisMailbag: Roger Federer’s Loss to Dimitrov is the Biggest Upset of This U.S. OpenDateSeptember 4, 2019In relation toTennisThe Key Stat Fuelling Dimitrov’s ResurgenceDateSeptember 5, 2019In relation toTennis