By Shrivathsa Sridhar LONDON (Reuters) -Seven-time Wimbledon champion Novak Djokovic was made to work hard after a strong start as he began his bid for a 25th Grand Slam title by beating unseeded Frenchman Alexandre Muller 6-1 6-7(7) 6-2 6-2 to reach the second round on Tuesday.

Novak Djokovic overcomes physical issues to join Jannik Sinner in the Wimbledon second round, but third seed Alexander Zverev is out.

To think, this had promised to be such a serene evening’s work for Novak Djokovic that his seven-year-old daughter, Tara, seemed more preoccupied with her colouring-in book. But out of a clear blue sky came an almost inexplicable act of self-sabotage.