The Latest: Play underway on middle Sunday at Wimbledon

Former tennis star Martina Navratilova, front centre, and her wife Julia Lemigova, front left, sit in the Royal Box during day seven of the Wimbledon Tennis Championships in London, Sunday, July 3, 2016. (AP Photo/Alastair Grant) (The Associated Press)

Sloane Stephens of the U.S, right, and Svetlana Kuznetsova of Russia arrive on court for their women's singles match on during day seven of the Wimbledon Tennis Championships in London, Sunday, July 3, 2016. (AP Photo/Ben Curtis) (The Associated Press)

Coco Vandeweghe of the U.S returns to Roberta Vinci of Italy during their women's singles match on day seven of the Wimbledon Tennis Championships in London, Sunday, July 3, 2016. (AP Photo/Ben Curtis) (The Associated Press)

The Latest on Wimbledon (all times local):

11:50 a.m.

Play is underway on Day 7 at Wimbledon, only the fourth time in the tournament's 139-year history that matches are being played on the middle Sunday.

Sixth-seeded Roberta Vinci opened play on Centre Court against Coco Vandeweghe of the United States in a third-round match. No. 13 Svetlana Kuznetsova faced No. 18 Sloane Stephens on Court No. 1.

Play began under gray skies, but the forecast called for mainly dry conditions and warmer temperatures reaching 22C (72F).

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10:30 a.m.

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.