Aryna Sabalenka has held No. 1 for a year, but New York could decide whether that streak survives. With a 50-10 record and three titles in 2025, she’s been consistent, yet the US Open and summer hard-court swing can flip the rankings fast. Rivals like Iga Swiatek, Coco Gauff, and Elena Rybakina are close. Here’s how the math, the draw, and form could shake up the top spot.