Russias Andrey Rublev said it is impossible to explain after defeating Roger Federer in the third round of the Cincinnati Open on Thursday. The Russian qualifier beat 20-time Grand slam champion 6-3, 6-4 and hailed the former world number one as a true legend. It was Federers quickest defeat since losing to Franco Squillari in 54 minutes in Sydney in 2003. It is impossible to explain. I dont know. I mean, the way even how he (Roger Federer) finished the match, it was so amazing, said Rublev. .@AndreyRublev97 What a match against a true legend🙏❤️ a big honour for me🙏🙏❤️🎾 @CincyTennis | #ATPTour pic.twitter.coml7WGBVChvu— ATP Tour (@ATP_Tour) August 16, 2019×🇨🇭 @rogerfederer reacts to his loss against Andrey Rublev at @CincyTennis. 💭— ATP Tour (@ATP_Tour) August 15, 2019×Rublev couldnt put his emotions into words after the match and said, I told him it was a big honour and he said no worries. The way he did it, it was amazing. Now I feel that he is a true legend and that is what my feeling inside is, Rublev said. Rublev’s win sets up an all-Russian quarter-final with ninth seed Daniil Medvedev.