Novak Djokovic continued his preparations for Wimbledon by saying the return of 44-year-old Serena Williams has put an extra spring in his step

Novak Djokovic is taking inspiration from Serena Williams' sensational comeback as he sets his sights on a record-breaking triumph at Wimbledon.

Djokovic, 39, and Williams, 44, have 47 Grand Slam singles titles between them.