The 133rd-ranked Russian teen lost in U.S. Open qualifying Friday, but when third-seeded Maria Sharapova withdrew Sunday because of an injury, Kasatkina was suddenly in her first Grand Slam main draw as a "lucky loser." In a quarter of the draw full of upsets, she will face yet another unseeded player in the next round, 40th-ranked Kristina Mladenovic or 98th-ranked Bojana Jovanovski. Keys has now advanced to at least the third round at every major this year, which started with her breakthrough run to the semifinals at the Australian Open.