Defending champion Coco Gauff beat Eva Lys in straight sets to reach her third consecutive China Open semi-final.
The world number three took one hour and 28 minutes to overcome her German opponent 6-3 6-4.
The American, a two-time Grand Slam winner, broke Lys three times in the opening set, converting three of her four break point opportunities.
Gauff, who has struggled with her serve at times this season, had an impressive 79% first serve percentage throughout the match.
The 21-year-old, who was knocked out of the opening round of Wimbledon after winning the French Open earlier this year, is now the highest-ranked player left in the competition.
She will face either Amanda Anisimova or Jasmine Paolini in the final four.