On a Wednesday in the desert last March, Reilly Opelka, the American with a cannon of a serve, was grinding out a tough match against French number one Arthur Rinderknech. Nearby, former US Open men's finalist Kei Nishikori beat Luca Nardi, part of the new wave of Italian talent, while Brazilian phenom Joao Fonseca closed out Pavel Kotov, who reached number 50 in the world in 2024.