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The Latest: It's Manic Monday at Wimbledon, with all 16 4th-round matches on the schedule

  • Richard Gasquet of France makes a return to  Nick Kyrgios of Australia during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday July 6, 2015. (AP Photo/Kirsty Wigglesworth)

    Richard Gasquet of France makes a return to Nick Kyrgios of Australia during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday July 6, 2015. (AP Photo/Kirsty Wigglesworth)  (The Associated Press)

  • Andy Murray of Britain makes a return to Ivo Karlovic of Croatia, during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday July 6, 2015. (AP Photo/Alastair Grant)

    Andy Murray of Britain makes a return to Ivo Karlovic of Croatia, during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday July 6, 2015. (AP Photo/Alastair Grant)  (The Associated Press)

  • Novak Djokovic of Serbia returns a ball to  Kevin Anderson of South Africa during their singles match against at the All England Lawn Tennis Championships in Wimbledon, London, Monday July 6, 2015. (AP Photo/Tim Ireland)

    Novak Djokovic of Serbia returns a ball to Kevin Anderson of South Africa during their singles match against at the All England Lawn Tennis Championships in Wimbledon, London, Monday July 6, 2015. (AP Photo/Tim Ireland)  (The Associated Press)

The Latest from Wimbledon (all times local):

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11:25 a.m.

It's Manic Monday at Wimbledon and matches are about to get underway.

The craziest day of the two-week tournament at the All England Club has all 16 fourth-round matches on the schedule. Play on the outside courts will start shortly, while matches in the main stadiums won't start until about 1 p.m.

One of the marquee matches, five-time champion Serena Williams against five-time champion Venus Williams, is first up on Centre Court. Andy Murray and Roger Federer will also play in the main stadium.