Sloane Stephens defeated Venus Williams while Madison Keys beat CoCo Vandeweghe in the semifinals on Thursday
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The win sets up a meeting with Rafael Nadal on Friday
The American defeated the world number one to advance
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
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