Popsugar Fitness Celebrity Fitness Who Is Naomi Osaka? 8 Things You Need to Know About US Open Sensation Naomi Osaka September 8, 2018 by Tamara Pridgett First Published: September 6, 2018 View On One Page Photo 2 of 8 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 The 20-Year-Old Has a 120 MPH Serve and a Powerful Forehand Previous Next Start Slideshow AthletesTennisUS Open