Their father, Richard, later accused fans of racial abuse. Serena returned to the tournament in 2015, while Venus played the following year.

Two-time Wimbledon champion Petra Kvitova, 34, has also been handed a wildcard after her announcement earlier this month that she would return to tennis following the birth of her first child in July.

On the men's side, Brazil's 18-year-old rising star Joao Fonseca, who won his first ATP Tour title at the Argentina Open on Sunday, was granted a wildcard along with American 19-year-old Learner Tien, who reached the fourth round of January's Australian Open.