Australian wildcard Stosur (35) progressed to her first WTA singles final in two-and-a-half years as the 2011 US Open champion came from behind to beat Switzerland's Viktorija Golubic 2-6 7-6 (4) 6-1.
Kenin won her first singles title of 2019 on the hardcourts of Hobart, Australia in January, and added her second on grass in Mallorca in June.
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Sofia Kenin of the United States hits a return against Anna Blinkova of Russian Federation during their women's singles semi-final match at the Guangzhou Open tennis tournament in Guangzhou in China's southern Guangdong province on September 20, 2019.
World number 20 Kenin, who reached the last 16 at the French Open this year, found herself two games away from defeat at 4-4 in the second set but switched gears to drag the match into a decider.
What's interesting is her head to head record against Stosur isn't what you would expect, especially considering she has played the Aussie only in the last two years - around the time when Stosur has had big troubles getting going. For a former US Open champion, this has been a huge fall, having tasted the number four ranking in the world at one point. "She's very tough to play against so I'm just happy to get through".