American 10th seed Serena Williams breezed into the fourth round of the ATP/WTA Miami Masters with a 6-2, 6-1 win over Italian number 21 seed Roberta Vinci on Saturday. Williams, who is playing her first tournament since a fourth-round exit at the Australian Open, will face either Australian sixth seed Samantha Stosur or South Africa\'s Chanelle Scheepers for a place in the last eight.