NEW YORK -- Two years ago, Naomi Osaka sat in the stands at Arthur Ashe Stadium and watched Coco Gauff advance to the US Open final with a win over Karolina Muchova.For Osaka, it was a stark reminder of where she had been -- and where she was in the moment.She was three years removed from her last title at the tournament, and just two months from giving birth to her daughter, Shai. Being a spectator reminded her of what it was like to play in front of 24,000...