Naomi Osaka is currently in New York City working on her side hustle — professional tennis. The No. 13 player in the world told reporters at the US Open that she views tennis exactly like that, secondary to being a mother to her 3-year-old daughter, Shai. “I think people forget my main job is to be a mom,” Osaka, 28, said on Saturday, August 29, before the tournament got underway. “This [tennis] is kind of like my side hustle a little bit. I just happen to be really good at it.” The two-time US Open champion added that Shai herself is learning the game. Though she hasn’t ta...