ORDER OF PLAY
Play starts at 2pm
 M SAKKARI (GRE) v S ZHENG (CHN)
S AOYAMA (JPN) / E SHIBAHARA (JPN) v D KRAWCZYK (USA) / A ROSOLSKA (POL) 
Not before 7pm
 D VEKIC (CRO) v A SABALENKA (BLR) 
Not before 4.30pm
After suitable rest
N MELICHAR (USA) / K PESCHKE (CZE) v E-S LIANG (TPE) / S ZHENG (CHN)
Maria Sakkari meets Zheng Saisai for the second time, having beaten the Chinese player at Wimbledon three years ago.
Saturday represents Zheng's first Premier-level semifinal.
Donna Vekic won the only previous meeting with Aryna Sabalenka, taking the honors in three sets on the ITF circuit in 2016.
Sabalenka is taking part in her fourth semifinal of 2019.
Vekic hopes for her third Top 10 win of the year.
Sakkari is the only previous finalist involved on Saturday, the Greek having lost last year's final.
Sakkari has been taken to three sets in two of her three matches this week, while Zheng was only taken the distance by Amanda Anisimova in the quarterfinal.
Vekic and Sabalenka have both dropped one set this week.