Yes, you can wear sunglasses with polarized lenses when you are playing tennis so as to screen off the ultraviolet rays and dazzling lights or reflection lights and so on, so as to make you see better. And it is better to choose those quality sports sunglasses that are specially intended for people who are doing sports, such as the "Shield" of Adidas, the "Noyz Golf/Tennis" of Rudy Project, the "Kicker" of Bolle, and so on. When playing tennis in the open on a sunny day, the ultraviolet rays in the strong sunlight will do great harm to the eyes and the dazzling and reflected lights can also impact your eyesight as well as your performance. When you are choosing a pair of sunglasses for sports like tennis, you should pay attention to the color, material, and dark brown and deep green with light and quality material is the best.