WIMBLEDON, England — As the women’s field at Wimbledon was halved to eight from 16, a No. 1 lost her spot atop the WTA rankings, and the No. 4 and No. 5 seeds also fell.

Just another Manic Monday at the All England Club, though havoc has been a fixed menu item throughout this season of women’s tennis, with top stars often absent, or present-but-struggling.

The rankings of the fading and brightening stars are realigning, though the outcome remains unclear.

In a match between the two most recent Wimbledon runners-up, 14th-seeded Garbiñe Muguruza beat top-seeded Angelique Kerber, 4-6, 6-4, 6-4, unseating Kerber from her perch as No. 1 in the WTA rankings. Kerber, last year’s finalist, will have spent 34 weeks in the top spot, hanging on even as her results this season have consistently fallen short of her sterling results last year.