NEW YORK (AP) The last spots in the U.S. Open semifinals will be decided Wednesday, with Serena Williams, Andy Murray and Juan Martin del Potro seeking to keep their dominant runs going.
The top-seeded Williams, who hasn't lost a set or had her serve broken in the tournament so far, faces No. 5-seeded Simona Halep. Williams has won seven of their last eight meetings.
The other women's quarterfinal pits two women who've never been this far before at a Grand Slam tournament: 10th-seeded Karolina Pliskova of the Czech Republic and 92nd-ranked Ana Konjuh of Croatia.
On the men's side, four of the tour's best hard-court players meet in the last two men's quarterfinals, with the No. 2-seeded Murray facing No. 6 Kei Nishikori in the afternoon, and No. 3 Stan Wawrinka taking on del Potro at night. Murray has dropped only one set in the tournament, and del Potro has lost none.
The roof on Arthur Ashe Stadium is currently open under partly cloudy skies, with a chance of rain in the afternoon.