Naomi Osaka's Forehand Goes Awry and She Loses in the US Open's Second Round to Karolina Muchova

Karolina Muchova has eliminated two-time U.S. Open champion Naomi Osaka 6-3, 7-6 (5) in the second round at Flushing Meadows

Karolina Muchova has eliminated two-time U.S. Open champion Naomi Osaka 6-3, 7-6 (5) in the second round at Flushing Meadows