Footage of John Isner hitting his serve in super slow motion at the 2013 Cincinnati Open.
Hit the most ACCURATE groundstrokes of your life with this coaching series – Click Here!
Comments? Questions? Leave them down below. Thanks for watching!
Footage of John Isner hitting his serve in super slow motion at the 2013 Cincinnati Open.
Hit the most ACCURATE groundstrokes of your life with this coaching series – Click Here!
Comments? Questions? Leave them down below. Thanks for watching!