“By being a tennis player I want to promote peace all over the world,” he said after his Mexico Open quarter-final last month.
In an Instagram post after becoming world No 1, the 26-year-old expanded on his message as he wrote: “Do you all remember what I have said after Australian Open final? This story was just about me, my childhood dreams. And today I want to speak on behalf of every kid in the world.
“They all have dreams, their life is just starting, so many nice experiences to come: first friends, first great emotions. Everything they feel and see is for the first time in their lives.
“That’s why I want to ask for peace in the world, for peace between countries.
“Kids are born with inner trust in the world, they believe so much in everything: in people, in love, in safety and justice, in their chances in life. Let’s be together and show them that it’s true, cause every kid shouldn’t stop dreaming.”