TIANJIN - Chinese star Peng Shuai retired while trailing 1-3 in the first set on Saturday, sending Belinda Bencic of Switzerland into the Tianjin Open tennis final.

"I am exhausted and I can barely move my feet," said Peng, who also quitted in the middle of a U.S. Open semifinal.

The third-seeded Swiss will take on American Alison Riske, who crushed Chinese Zheng Saisai 6-0, 6-1.