Serena Williams saw her bid for a record seventh US Open title halted in the semifinals by a determined Karolina Pliskova.
Novak Djokovic heads into the US Open semi-finals as the overwhelming favourite to go on and lift a third title in New York.
Serena Williams will be wary of another semi-final slip-up when she takes to the Arthur Ashe Stadium court to face 10th seed Karolina Pliskova.
Swiss third seed Stan Wawrinka outlasted tiring former champion Juan Martin del Potro in four sets to advance to the semi-finals of the U.S. Open.
Simona Halep did something no one else was able to do against Serena Williams at the US Open tennis championship.
Karolina Pliskova swept past Croatian teenager Ana Konjuh 6-2 6-2 to roar into the semi-finals of the U.S. Open.
Andy Murray and Serena Williams again take center stage, when the US Open semi-final lineup will be completed.
Ana Konjuh was not a year old when Serena Williams played her first US Open match but both will be in the Arthur Ashe Stadium spotlight today.
Novak Djokovic's strange US Open took another bizarre turn as he advanced to the semi-finals when Jo-Wilfried Tsonga retired.