A rusty Williams returned to the WTA Tour on the grass one week before Wimbledon in June from an extended foot injury break, but looked in top form last week as she upset the fourth seeded Victoria Azarenka of Belarus 6-1, 7-6(7-5) in a highly anticipated third round match.

With her legendary mental toughness, overpowering serve and aggressive groundstrokes, the 29 year old Williams should prove a formidable foe for the 21 year old Wozniacki.

Williams has won 13 singles grand slam tournaments while Wozniacki is yet to win a singles grand slam title despite her top WTA Tour ranking. Head to head Williams leads Wozniacki 2-0, but the two competitors have not faced each other since 2009.

Friends off the court, the Dane had visited Williams in California while the American was recovering from her foot injury, and had also sought out the American’s advice regarding her budding romantic relationship with the golfer Rory McIlroy.

Wozniacki, who has often been criticized for being too much of a counterpuncher, will need to think outside the box and attack from the baseline and the net and look for errors from the Williams game.

But look for Wozniacki to stick to her safe and consistent baseline game while Williams executes a more overwhelming mix of aces and baseline winners for the upset victory.