Juniors to Pros - Do their profiles change?

How did Tiafoe and Kozlov develop their games

In December 2013, two 15 year old Americans played in the final of the Orange Bowl International Championships for juniors. Fast forward 5 years and they played again as 20 year olds on the pro tour. We analysed both matches to determine how their 135 profiles had developed, and what parents and players can learn from…..