Melbourne - Fans across the world tuned in to see Novak Djokovic set up a 2019 Australian Open final against Rafael Nadal with a straight-sets win over Lucas Pouille.
His son was not among them.
Four-year-old Stefan was busy with other things, although he took time to give his old man a pep talk.
"No, my son is not watching me. He's going to pre-school," the six-time Australian Open champion said in his on-court interview.
"I actually talked with him 45 minutes before the match. He was telling me about Spider-Man. About, he was acting as a fish in an aquarium.
"He just tells me good luck - and make sure you win."
Djokovic's wife, Jelena, and two children didn't make the trip to Melbourne Park, but he's in regular contact.
"To be a father, there's no better thing that happened in my life," he said.
"With my wife, we've been together 15 years, now we're the parents of two angels. For me, this is life."