Geared Up: Joao Fonseca, 18, is carrying Brazil’s ATP hopes with Yonex and On

Racquet: Yonex VCORE 98 ($269)
Fonseca’s pure ball-striking and easy power off both wings combine with the VCORE 98 to produce punishing groundies. This latest version—the seventh generation—has a few new wrinkles to enhance the racquet’s already prodigious spin production.
The tip of the frame has been thinned slightly to