> The idea that the guy who had a tennis idea just happened to come by two daughters who were already possesing 85-90% god given talent for the sport he just ha

> The idea that the guy who had a tennis idea just happened to come by two daughters who were already possesing 85-90% god given talent for the sport he just happened to specifically pick is hard for a human to wrap their mind around I think. 1) You've got it backward. If that hadn't been true, you'd never have heard about them. You could drop the Williams sisters in practically ANY power sport given their size and build (Venus is REALLY BIG for a woman--she's 6' 1" and could likely play in the WNBA--Serena isn't exactly tiny--she's 5' 9"--that puts them at 3 and 2 standard deviations out, repectively) and they would dominate very quickly. If the Williams sisters played basketball or soccer, for example, they'd be a hugely dominant force there, instead. 2) Training did a big shift right about the 1990s when people like the Williams sisters were coming up--especially for female training. Navratilova was really the first female tennis player to adopt more scientific power training and reap the benefits. The players in the next generation (which includes the Williams sisters) that were steeped in that idea and put it into practice did very well in a LOT of different sports. They also easily blew through competitors who didn't do that--and at that point in the 1990s there were still a lot who didn't.