“The problem is that I tried to write it on my wrist, but it turns out that not every pen can write there,” Rublev told Russian outlet BB Tennis. “Then, because at school I always wrote on my palm, I realized that I could probably write it on my finger… After two games, it immediately fades away.
“Then I watched a video of Stephen Curry, a basketball player, where he talked about some of the tricks he used to help him focus. One of them was a phrase he wrote on his sneaker to remind himself, to help him trigger the right mood.
“I thought that a sneaker would be a good option, because it’s easy to write on it and it’s always close by.”