Tennis boycott and US Open tension

Djokovic meltdown at Cincinnati, retirement hint. Alcaraz withdraws, Sinner out with knee. Ben Shelton wins Canadian Open. US Open scheduling changes, wildcards announced (Venus Williams, Serena only doubles). New: Tennis grand slams unite to establish player council to defuse prize money row; US Open prize pool likely topping $100M; players threatened media boycotts. Mouratoglou worried for Sinner/Alcaraz; Swiatek resurgence, Rybakina closing on No.1, Jodar rising.