World No. 74 Karolina Muchova was disappointed that she had to give Naomi Osaka a walkover in Miami but added it was the right thing to do because playing the Japanese could have compromised her health. Muchova, 25, didn’t play in any events in the rest of 2021 after the US Open. After being sidelined for six months, Muchova returned to action in Miami. In her first tournament of the year, Muchova defeated Tereza Martincova and Leylah Fernandez to reach the Miami third round. “I’m sad that I cannot put up a battle against Naomi today.After a long break from tennis, 2 tough matches in row have been a lot for my body and I need longer to recover. Was nice to be part of @MiamiOpen again! I will be back on clay!” Muchova explained in a tweet. Muchova stunned Fernandez to set up an Osaka clash …