Novak Djokovic has been spending time with his tennis-loving son Stefan as the world number one prepares for the defence of his Wimbledon title. Djokovic has opted to play at the Mallorca Championships in Spain ahead of Wimbledon as it offered the chance to be close to his family and six-year-old Stefan. The Serbian will be competing for his sixth Wimbledon singles title, with four of those successes coming in the last six tournaments.