Taylor Fritz turned professional at age 17 which can be risky but the American held a firm belief he could be the best player in the world.
Fritz was an excellent junior player and he was elected fairly early to pursue tennis as a profession. His first ATP match came in Nottingham with his grand slam main draw debut coming a year later. His journey to the top 10 was fairly quick but the decision to pursue tennis wasn't easy.
Turning pro at 17, I would say, is every top junior's fear. What I did so well in the juniors, what if I don't make it. I felt like a switch flip as soon as I turned pro, and I was like 'now it's all real'. Everything I did before was awesome, but now it's like 'this is ... this is it'.
The key in Fritz's mind is to believe in yourself and your capabilities because if you don't, how can you expect to become that? He always believed he can make it to the top and being ranked in the top 10 right now; he was right.
I've always known like, how can you ever be the best in the world, if you don't truly, like, believe you can be. You're never going to accomplish all the goals if you want to if you actually have that belief that you can do it.