Understanding Tennis

get back on the return to handle the power service

on transition get your racquet up and in front of  your body 

get the back knee below the incoming flight path

keep your eyes up and see the hit

as you track the ball in slot your head and keep it there for a beat past the hit

back for is inside the front foot and angled in– presets the  shoulder and hip rotation

you want to go up and out before you rotate 

Medvedev has a great quick to the finish

up and out on the finish