Serena came so close to winning the grand slam and had one of the greatest years of any athlete man or woman in any sport ever. The Williams sisters are two of the greatest athletes that have ever and will ever walk this planet. Enjoy watching them while you still can. I know Ronda has done great things for her sport but what she did doesn't even come close to comparing what Serena has accomplished. We all saw what happened when Ronda had to go against another great MMA fighter beside Meisha. Meisha was the only good fighter Ronda has faced (and Ronda had Meisha's number) before Holly came along. Serena on the other hand has faced the greatest the world has to offer for years. I am still stunned that ESPN didn't vote Serena best female athlete last year.
Serena is x10 the athlete Ronda is. Serena is on of, if not THE greatest female athlete ever. Ronda isn't.
Gruelling sport, mate. Look at a top Tennis players diary - Rammed beyond belief. Their schedule is insane.
Women tennis probably has the biggest talent pool out of all women sports, a lot of women play tennis hardly any women fight, especially not in MMA. Ronda's last win was a 31 year old accountant who started training 3 years ago to get in shape (it's true, check it out on the net).