Why Jannik Sinner’s forehand is unique — and so dangerous on the tennis court

NEW YORK — In the history of tennis, a small number of players have possessed the ability to make a crowd gasp. From the sheer venom of an Andre Agassi return to the beauty of a Roger Federer half-volley and the crack of a Juan Martin del Potro forehand, a chosen few have had the gift.

And then there is the sound of a Jannik Sinner forehand.

The Italian’s groundstrokes are the bedrock of his game, the power and speed of…