Coco Gauff, the top seed at the National Bank Open and reigning US Open champion, was unexpectedly defeated by No. 14 Diana Shnaider, losing 6-4, 6-1 in the third round. Gauff attributed her performance to her own struggles, including numerous unforced errors and double faults, particularly in windy conditions. Shnaider, ranked No. 24, celebrated her first victory against a top-10 player and advanced to the quarterfinals, where she will face Liudmila Samsonova. Meanwhile, Gauff's early exit marks a setback as she prepares to defend her U.S. Open title. Other notable matches included victories for Jessica Pegula and Aryna Sabalenka, highlighting a strong showing from American players in the tournament.