Serena and Venus Williams have added themselves to the list of big-name withdrawals from the U.S. Open.

Novak Djokovic will get his bid for a third major title of 2021 started at Centre Court by facing wild-card entry Jack Draper as Wimbledon begins.

Forget all that speculation about Serena Williams considering retirement after her emotional hand-to-heart gesture upon her Australian Open exit three months ago.