The quarterfinals match between Novak Djokovic and Carlos Alcaraz at the Australian Open on Tuesday was one for the books. Djokovic ended up coming back from one set down to beat the young star 4-6, 6-4,

Murray pantomimed the swing of a two-handed backhand. Djokovic took it all in, then responded. The scene was remarkable because of the new — and “a little bit strange,” Djokovic said Monday night — relationship between these two stars of their sport,