From this point simply swing forward and up and the racquet will naturally become vertical at contact, provided that you swing from the shoulders and do not get too wristy.
Metallic glasses also have an incredible ability to store and release elastic energy, which makes them perfect for sports equipment, like tennis racquets, golf clubs, and skis.
Stone said, We went to the U.S. Open ... and I was sitting next to Billie Jean, and Sloane Stephens was catching balls and tucking them in her skirt and bouncing them with the racquet.