In the late 1970s, a man named Richard Williams was watching TV when he happened to notice a woman named Virginia Ruzici earning a $30,000 check for winning the French Open. At that moment in time, he decided that he would get rich by coaching his future children to be champion tennis players. A hare-brained scheme? One might think. But his two daughters, Venus and Serena Williams, became two of the greatest tennis champions of all time.