Top seed and defending champion Serena Williams breezed into the Wimbledon fourth round but vowed to keep fighting for equal rights under the bright lights of the All-England Club.

World No 1 she may be, but the 31-year-old American was slated as the last match on Court One on Saturday.

With two marathon men's matches before her, she saw her third-round clash with 42-year-old Kimiko Date-Krumm suddenly shifted to Centre Court under the roof and the lights.