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Sloane Stephens started the WTA finals in Singapore with a win. The American was too strong for Naomi Osaka of Japan Monday in three sets.
Stephens, number six in the world, defeated Osaka, four years old, in two hours and 26 minutes with a 7-5. 6 and 6-1. The party was a showdown between the last two winners of the US Open
. Stephens and Osaka, number four worldwide, are classified in the red group, which also includes Kiki Bertens. De Wateringse faces Angélique Kerber on Monday, the world number two.
Bertens, 26, won Sunday ninth place in the world rankings. With that, she reaches her highest position in the WTA rankings.
The first two players in each group at the WTA Finals qualify for the semi-finals. There is a meeting with a white group player.
In this group, Elina Svitolina and Karolína Plísková won on Sunday. Svitolina knocked out Petra Kvitová and Plísková dismissed Caroline Wozniacki.
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