Olympic champs Zverev, Bencic reach US Open quarterfinals
Alexander Zverev, of Germany, celebrates after winning his match against Jannik Sinner, of Italy, in the fourth round of the US Open tennis championships, Monday, Sept. 6, 2021, in New York. (AP Photo/Seth Wenig)

Alexander Zverev, of Germany, celebrates after winning his match against Jannik Sinner, of Italy, in the fourth round of the US Open tennis championships, Monday, Sept. 6, 2021, in New York. (AP Photo/Seth Wenig)

Sep. 06, 2021 02:53 PM EDT
Belinda Bencic, of Switzerland, celebrates her win over Iga Swiatek, of Poland, during the fourth round of the US Open tennis championships, Monday, Sept. 6, 2021, in New York. (AP Photo/Elise Amendola)

Belinda Bencic, of Switzerland, celebrates her win over Iga Swiatek, of Poland, during the fourth round of the US Open tennis championships, Monday, Sept. 6, 2021, in New York. (AP Photo/Elise Amendola)

Sep. 06, 2021 01:32 PM EDT