Andy Murray hiring Ivan Lendl and Novak Djokovic appointing Boris Becker were two breathtaking moments of surprise.
But the news that Murray will coach Djokovic at January's Australian Open may cause even more exhilaration. I am sure I am not the only one who checked the date, to make absolutely certain it was not 1 April.
These two are only seven days apart in age, and shared the court in seven Grand Slam singles finals.
Friends as juniors, they became rivals as seniors. There was many a heated moment along the way but, helped by a shared history, they mostly seemed to get along pretty well.