That change came in the form of new coach Dinara Safina, a former world No. 1 making a welcome return to tour alongside brother Marat Safin, who has begun coaching countryman Andrey Rublev.

Joao Fonseca has become the biggest ATP sensation this season and has been making headlines. Despite being only 18, the Brazilian has already won one tour-level title and has earned his first Top 10 ...