China’s Peng Shuai has left doubts behind, sweeping into the US Open semi-finals to join Li Na and Zheng Jie as the only Chinese to reach a grand slam last four.

Peng, who was in the quarter-finals of a major for the first time at her 37th attempt, took apart Swiss 17-year-old Belinda Bencic 6-2 6-1 in just 64 minutes.

“Thirty-seven times grand slam,” Peng said, then had to stop the thought as she struggled to contain her emotions.

“It’s a little bit too exciting,” she said.

“I love tennis, I love to play, but it’s a long time, the career. It’s tough. Sometimes I’ve thought to give up and stop playing because I don’t know if I can make it or not.

“My coach and my parents always told me to fight and not give up – that today was coming.”

Now Peng will fight on Friday for a place in the final against either former world No.1 Caroline Wozniacki or 13th-seeded Italian Sara Errani.

Tenth-seeded Wozniacki, the 2009 runner-up who is in a grand slam quarter-final for the first time since the 2012 Australian Open, last reached a major semi-final since the 2011 US Open.

Wozniacki toppled former champion Maria Sharapova in the fourth round, while Errani’s run included a third-round win over seven-time grand slam champion Venus Williams as upsets saw only two of the top 10 seeds reach the last eight.

Wozniacki has won two of three career meetings with Errani, who reached the semi-finals at Flushing Meadows in 2012.

Peng took control early against Bencic, the youngest US Open quarter-finalist since Martina Hingis won the title at 16 in 1997.

Peng fended off two break points in her opening service game and didn’t face another.

She broke Bencic twice in the first set, and seized a 4-0 lead with two breaks of serve in the second.