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					Originally Posted by  Nadal Fan
					 
				 
				Would this be the biggest upset in US Open history? Maybe Federer and Millman? 
			
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Before your time and maybe not the biggest upset of all time, but pretty shocking when it happened...
No. 3 Seed Arthur Ashe Upset by unseeded Bjorn Borg, 3rd Round, 1973  6-7, 6-4, 6-4, 6-4.