Eventually , though , Janko 's vision worsened and he needed to start wearing some sort of prescription lenses .
Like many other tennis players , Janko Tipsarevic was wearing glasses to protect eyes from the sun .
Eventually , though , Janko Tipsarevic 's vision worsened and Janko Tipsarevic needed to start wearing some sort of prescription lenses .
Like many other tennis players , Janko Tipsarevic was wearing glasses to protect eyes from the sun .