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.