NEW YORK :The site of the U.S. Open will undergo an $800 million transformation, the USTA said on Monday, with a "top-to-bottom" modernisation of the famed Arthur Ashe Stadium and a new player performance center planned for the sprawling Queens campus. Work at the Billie Jean King National Tennis Center will be completed by the 2027 U.S. Open, with construction taking place in phases to avoid any interruption of the 2025 or 2026 editions of the tournament. The project will be entirely self-