Roger Federer has been knocked out of the US Open in the fourth round by world number 55. John Millman.
It is the first time Federer has lost to a player ranked outside the top 50 at the US Open.
Australian, Millman will play two-time champion, Novak Djokovic in his first Grand Slam quarter-final on Wednesday.
Federer, bidding for his 21st Grand Slam, missed set points in the second and third sets before capitulating in the fourth-set tie-break.
It was Federer’s first defeat in 41 matches at the US Open against a player ranked outside the top 50.
Millman, 29, had never beaten a top-10 player before.
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