Karolina Pliskova calls Ashleigh Barty's slice backhand the best slice she's seen since Roberta Vinci.
Now, world No. 1 Barty shares technique tips to help you sharpen your slice.
More: Twitter Responds to US Open, Tour Resuming
In this instructional video for her racquet sponsor, Head, the reigning Roland Garros champion says her trademark slice begins with a strong left leg.
Alexander Zverev stresses preparation, proper timing and quick recovery as the keys to his vaunted running forehand.
Photo credit: Rogers Cup Facebook