Understanding Tennis

on the serve one choice is to drop down on the start

on the follow through drive up and out

Sinner did get a knockdown of Monfils 

going low to high and finish on the hit side

on the two handed backhand finish get both elbows up

on the jam serve pull the front leg away from the ball 

track it all the way in 

drive the slice out

on the open stance hit keep both toes towards the net and rotate

rotate your shoulders and hold the racquet

at the Open all lines on every court were called electronically

when you use your legs spring up and in

on your volley move your feet through the hit