Serena Williams loses her balance on a shot to Karolina Pliskova, of the Czech Republic, during the semifinals of the U.S. Open tennis tournament, Thursday, Sept. 8, 2016, in New York. (AP Photo/Julio Cortez)
Serena Williams loses her balance on a shot to Karolina Pliskova, of the Czech Republic, during the semifinals of the U.S. Open tennis tournament, Thursday, Sept. 8, 2016, in New York. (AP Photo/Julio Cortez) Julio Cortez AP
Serena Williams loses her balance on a shot to Karolina Pliskova, of the Czech Republic, during the semifinals of the U.S. Open tennis tournament, Thursday, Sept. 8, 2016, in New York. (AP Photo/Julio Cortez) Julio Cortez AP

Serena Williams upset in U.S. Open semifinals by Pliskova

September 08, 2016 9:02 PM