Pliskova served her fourth double fault to give Stephens a double break lead of 4-1 and she powered on to take her place in Sunday's final by wrapping up the set 6-1.
"Before I really had like, 'Oh, those are great players, and I can never beat them.' Now I'm still thinking those are great players but I have beaten them before, so hopefully I can do it again today".
"Of course I know that I've won lots of finals", Svitolina said.
"I have done qualifying for my first final here, beat some awesome players, played four really great matches".
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The Chinese yuan fell to 6.9641 against the greenback, flirting with its weakest point in almost a decade. In Asia, Japan's benchmark Nikkei 225 lost 0.4 percent, while South Korea's Kospi dropped 1.8 percent.
"But I was staying very positive and I think that's what made the difference this week".
"I just really wanted to try because this is the last tournament, and I felt it was really unfair to everyone that came to watch".
Sloane Stephens has battled back from dropping the first set to love to reach the final at the WTA Finals.
Kerber plays the unbeaten Stephens in the last round-robin match from Red Group, with the victor joining Bertens in the semi-finals.
Svitolina might be one of our readers, because shortly after she demolished Petra Kvitova in her opening match, she dedicated the win to those detractors.
The match started tensely, with Kerber unable to convert seven break points in Stephens´ first three service games, and the missed opportunities proved costly.
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On third-and-10 from the Packers' 21-yard line, Gurley had a clear path to the end zone on an outside run. This was one of the best games of this week, and that should be a top matchup next week.
She is seeded No. 3 in Singapore and has a must-win clash with Kiki Bertens on Friday.
Naomi Osaka believes she can be a force on all surfaces next year after suffering an anticlimactic end to her magnificent breakthrough season at the WTA Finals.
The No. 6-seeded Svitolina captured the title in only her second appearance at the year-end finals, past year losing in the round robin portion of the championships in her debut. Kerber says she plans to take a four-week rest this year like she did last year. after learning from her mistakes in 2016 "2016 was definitely not enough free".
Osaka was in tears after her retirement, which left her without a win at this tournament.
Svitolina split with coach Thierry Ascione in October and worked with Andrew Bettles in Singapore but said she would look at her options during the off-season.
Despite her defeat, Stephens said: "My first time in Singapore was incredible".
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As the so-called migrant caravan makes its way north, national attention has shifted to the US border with Mexico once again. Trump called O'Rourke "a stone-cold phony" and a "radical, open borders left winger".