Dallas–By signing an agreement with Web marketer YouthsportsUSA.com, sporting goods supplier Sport Supply Group (SSG) aims to slam-dunk the competition by managing and supplying product for the marketer’s online store. SSG will market its products to more than 7 million children and other youth sports participants through YouthsportsUSA.com, which manages the Websites for more than 30,000 leagues across the United States.