Last year’s US Open champion Coco Gauff played Spain’s former world number two Paula Badosa in the other semi-final in Beijing.
World number two Sabalenka was on a streak of 15 victories in a row, claiming titles in Cincinnati and then the US Open for the first time.
The Belarusian previously had trouble though with Muchova, who this time last year was inside the top 10 before injury struck.
US Open semi-finalist Muchova had won the last two meetings between them with both going to a deciding set.
This encounter proved to be just as tight.
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