The American defeated the world number one to advance
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Fans were treated to two compelling matches in the night session on Arthur Ashe Stadium
Juan Martin Del Potro will advance to face Roger Federer on Wednesday
The Four-Seed still has a chance to leave New York as world no.1
The Argentine eliminated the 2014 US Open champion on Friday
The top-seed and fourth-seed continued their quest for a title on Thursday
The Frenchman overcame a strong effort by the young American
The two greats were forced to overcome obstacles but moved into the second round at the US Open
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