LONDON -- The good news is Serena Williams is finishing her matches so quickly that she can get to the other pressing Olympic duties of the day.
As in keeping an eye on gymnastics and swimming, namely her good friend swim star Ryan Lochte, who was to compete against Michael Phelps later on Thursday in the 200-meter individual medley.
The minor issue of an Olympic quarterfinal singles match didn't get in the way. Williams, fresh off her Wimbledon win last month, dispatched former No. 1 Caroline Wozniacki of Denmark, 6-0, 6-3, never facing a break point on her own serve.
In the semifinals, No. 4 Williams will play top-seeded Victoria Azarenka of Belarus. Azarenka, who won this year's first major, the Australian Open, defeated Angelique Kerber, 6-4, 7-5, of Germany in another quarterfinal. Kerber had crafted the biggest upset on the women's side on Wednesday, beating Venus Williams in two tiebreakers.