Svitolina (world No.7) beat Bertens (world No.9) 7-5, 6-7(5), 6-4. The match lasted over 2 hours and 37 minutes on a court in Singapore, Ukrinform reports.
The Ukrainian tennis player will take on either Sloane Stephens (world No.6) or Karolina Pliskova (world No.8), who will play later on Saturday.
The WTA Finals championship match with a prize fund of $7 million will take place on Sunday, October 28.
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