British number one Katie Boulter was defeated by Aryna Sabalenka in the third round of the Canadian Open, losing 6-3 6-3. Despite the loss, Boulter's performance was seen as encouraging ahead of the US Open. Earlier in the tournament, Boulter advanced to the third round after Beatriz Haddad Maia retired due to injury. Coco Gauff also suffered a surprising defeat to Diana Shnaider, losing 6-4 6-1, and admitted to struggling physically and mentally. Both Boulter and Gauff plan to compete in the Cincinnati Open next week as a final warm-up before the US Open.