Novak Djokovic and Carlos Alcaraz picked up wins Wednesday to advance to the third round of the Australian Open.

Novak Djokovic and Andy Murray faced each other 36 times throughout their tennis careers, mostly in finals and often at the business end of a grand slam. But at this year’s Australian Open, their decades-long rivalry has taken an unexpected turn.

Novak Djokovic stood with his hands on his hips, listening intently to Andy Murray — his longtime on-court rival and now, stunningly, his coach at the Australian Open — between sets at Rod Laver Arena.