Del Potro: Day I Lost Fear of Federer
The day Juan Martin del Potro saw Roger Federer unleash his frustration on a chair umpire is the day del Potro lost his fear of Federer.Recalling his run to the 2009 US Open crown when he made history as the first man to knock off Rafael Nadal and Federer in succession in a Grand Slam, del Potro said one moment changed his perception of the Swiss superstar.Watch: Greatest US Open RecordFederer unloaded on chair umpire Jake Garner during the 2009 US Open final claiming the umpire gave del Potro excessive time to challenge a call.See the 20-time Grand Slam champion vent on Garner at 33 seconds of this video:











