Fearless Russian qualifier Andrey Rublev needed just over an hour to beat Roger Federer 6-3 6-4 in the third round of the Cincinnati Master, the Swiss 20-time Grand Slam champion suffering his quickest defeat for 16 years.
Rafael Nadal swept past Russian teenager Andrey Rublev to set up a possible the US Open semi-final against Juan Martin Del Potro.
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