Mailbag: Roger Federer’s Loss to Dimitrov is the Biggest Upset of This U.S. Open Tennis by el-admin - September 4, 2019 0822 Jon Wertheim mailbag: Federer, Osaka, Djokovic upset at US Open | SI.com Mailbag: Roger Federer’s Loss to Dimitrov is the Biggest Upset of This U.S. Open Modal message Share this: Mailbag: Comparing Tiger Woods’s Comeback to Federer’s and Serena’sDateApril 17, 2019In relation toTennisRoger Federer Suffers Upset Loss to Grigor Dimitrov in U.S. Open QuarterfinalDateSeptember 4, 2019In relation toTennisGrigor Dimitrov Plays Improbable Spoiler to Fedal in Epic Upset of Roger FedererDateSeptember 4, 2019In relation toTennis