Navratilova & Fernandez Help USTA Serve Up Its "Biggest" Youth Tennis Initiative Ever! Martina Navratilova, the winningest women's tennis champion of all time, and Mary Joe Fernandez, a two-time US Olympic tennis gold medalist and Grand Slam tournament winner, step into the tennis shoes of a child as they battle it out on an oversized tennis court using five-foot long racquets and an oversized tennis ball to simulate what it feels like for a child learning to play tennis. In one of its ...