The letter calls for a greater share of revenues, contributions to pension, health and maternity benefits, and a greater say via a new player council.

With his second US Open title, the Spaniard moved ahead 10-5 in the pair's series—and reclaimed the No. 1 ranking.

The 2001 Wimbledon winner stands by his tough-love comments, as Tsitsipas reveals he is building a new team—with dad Apostolos possibly back at the helm—and distancing himself from “dictators.”

The plan includes adding an 8,000-seat stadium with a retractable roof and 38 other grass courts—an upgrade that would almost triple the size of tournament grounds.

The trio suffered headline-grabbing exits from SW19.