Wozniacki, Vinci win opening matches in Sofia

SOFIA, Bulgaria (AP) - Caroline Wozniacki and Roberta Vinci had easy straight-set victories Tuesday in their first round-robin matches at the season-ending Tournament of Champions.

The top-seeded Wozniacki defeated Hsieh Su-Wei of Taiwan 6-2, 6-2 in 60 minutes while it took Vinci five minutes longer to rout Slovakia's Daniela Hantuchova 6-1, 6-2.

Wozniacki converted all five of her break points and only lost her serve once, in the second set.

The fourth-seeded Vinci dominated throughout, breaking five times. The two traded breaks to start the second set, but the Italian then jumped out to a 4-1 lead to take control.

Wozniacki will play Vinci on Wednesday, with the winner likely clinching a spot in Saturday's semifinals. The first two in each group advance.