Karolina Pliskova beat defending champion Caroline Wozniacki 6-2 6-Four on the opening day of the WTA Finals in Singapore.
Czech world quantity eight Pliskova, 26, broke early in each units to win in a single hour 32 minutes within the White Group.
Australian Open champion Wozniacki, from Denmark, did not win any of the 10 break factors she created.
Ukraine’s Elina Svitolina beat Czech Petra Kvitova 6-Three 6-Three in the identical group earlier on Sunday.
The occasion options the main eight gamers this yr, break up into two teams of 4.
The highest two gamers from every round-robin group will progress to the semi-finals, with the ultimate on 28 October.
Within the Purple Group on Monday, Japan’s US Open champion performs American Sloane Stephens, whereas high seed Angelique Kerber, from Germany, meets the Netherlands’ Kiki Bertens.
The Finals are being held in Singapore for the fifth and remaining time earlier than shifting to Shenzhen in China.