Serena Williams was the No. 1 tennis player in the world in January of last year. She had just beaten big sister Venus to win the Australian Open for a seventh time. Oh, and she did it while being 8 weeks pregnant. It was an incredible feat. Yet, Serena's pregnancy, which obviously kept her off the professional tennis circuit for months, is now the reason she has fallen to No. 453 in the world. She is making her comeback grand slam debut at this month's French Open in Paris. But, because her maternity leave prevented her from competing for awhile,...