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Unlike his arch rival Roger Federer, Rafael Nadal is into the Flushing Final Four. Nadal advanced to his eighth U.S. Open semifinal after repelling gritty Argentine Diego Schwartzman 6-4, 7-5, 6-2 past midnight at Arthur Ashe Stadium. “Here I am semifinals, it’s super important for me,’’ said Nadal, who was treated for cramping in his...