What the winner said
On Varillas: "I know him from his last two years on the circuit. I know he is a specialist on clay. I knew I had to battle to win points, he doesn’t have a major weapon in his game, but he is a consistent player.
"I think I have played my best tennis so far."
Milestone of 17 Roland-Garros quarter-finals: "Of course, I’m proud of all my records. This means that I’m not a young man anymore. I’m not the same as 10 years ago. But with the way I played today, I’m very motivated to keep playing."
Djokovic's son joined his gym warm-up: "It’s a pleasure for me to see them both, my son and my daughter yesterday, today and tomorrow. When I’m with my son, who loves tennis, I’m a different person.
"It gives me a lot of motivation and inspiration to play. He loves tennis and maybe, he’ll play here one day."
Keeping tabs on title rivals: "You always follow the top guys. Of course, you're looking, you're analysing everyone's game. You're basically following what's going on in the draw.
"But most of the attention is obviously focused on you, on what you need to deliver on the court, how you need to perform, how you need to win the next match. It's only about the next step."