Djokovic, who has a historic haul of 23 Grand Slam titles to his name, enjoys picking the brains of Messi and has told ESPN Mexico of his latest meeting with the Argentine superstar: “It's a second time we met with each other. We talked 15 minutes about everything, I would like to meet him and talk about everything again. Messi is a phenomenon. He's a huge champion, I have a huge respect for him.”