Novak Djokovic questions John McEnroe comments over Serbian's private life

Novak Djokovic has questioned why John McEnroe made claims about his private life and likened his dip in form to the problems Tiger Woods experienced after the American golfer's infidelities were revealed.

Former Wimbledon champion McEnroe, now an in-demand tennis commentator, said on the BBC this week that Djokovic has "off-court issues with the family".