Angelique Kerber completed a rain-delayed 6-2, 3-6, 6-2 win over little known American Louisa Chirico on Thursday to reach the quarter-finals of the Hong Kong Open.
Serena Williams plays unseeded Russian Elena Vesnina, 29, in Thursday's first semi-final on Centre Court. Eighth seed Venus, 36, then faces Australian Open champion Angelique Kerber, 28.
Jelena Jankovic overcame Venus Williams in a battle of the former world number ones to set up a Hong Kong Open final clash with Angelique Kerber who thrashed Sam Stosur in straight sets.
Kerber beat Louisa Chirico 6-2, 3-6, 6-2; Konta withdrew with an abdominal strain.
Top-ranked Angelique Kerber quickly finished off her rain-delayed second-round match against Louisa Chirico at the Hong Kong Open on Thursday, dropping just one game to prevail 6-2, 3-6, 6-2