Madison Keys clinched her second consecutive semifinal berth by beating Carla Suarez Navarro 6-4 6-3 while Novak Djokovic beat Australian John Millman 6-3 6-4 6-4.
Hyeon Chung is the first Korean to reach the last four of a Grand Slam. On the women's side, Germany's Angelique Kerber Kerber is the only Grand Slam singles champion still in the draw.
The 2016 winner, seeded 21, brushed aside Madison Keys, 6-1, 6-2, breaking her much-vaunted serve at will as she triumphed in 51 one-sided minutes at Rod Laver Arena in Melbourne.
Sloane Stephens beat Madison Keys 6-3 6-0 in an all American US Open final to claim her maiden grand slam title.
Americans Sloane Stephens and Madison Keys, both struggling with serious injuries, advance to their first Grand Slam final at the US Open.
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