Day 1 of the 2025 U.S. Open tennis tournament in Flushing Meadows, New York marked the start of round one singles matches.

From Indonesia to Mexico to the Philippines, breakthrough wins at the US Open show how far the game’s reach has stretched.

With the US Open underway, Billie Jean King talks about the up-and-coming stars. The Hall of Famer asks: 'What can you do off ...