For only the fourth time in the tournament's 139-year history, the middle Sunday at Wimbledon is not a day for rest.

With rain delays during the first week forcing organizers to schedule Sunday matches for the first time since 2004, all 22,000 tickets were snapped up in 27 minutes when they went on sale online on Saturday.

Fans will get to see top-seeded and six-time women's champion Serena Williams, who plays in the day's second match on Centre Court against Germany's Annika Beck. The winner will move into the fourth round.

The tournament is still reverberating from the stunning exit of Novak Djokovic, whose bid for a fifth consecutive major title and the third leg of a calendar-year Grand Slam was stopped by American Sam Querrey in the third round.