Wow this is really hard to choose, so I looked to the recent WTA campaign - Strong is Beautiful - to help me decide. Sure, easy to say looks shouldn't be important in sport but that's not the world we live in. And tho people have criticised the WTA for glamming up/sexualising its players for the new campaign but I absolutely love it.
If I had to pick one female who is the most attractive, I'd pick Maria Kirilenko. She's absolutely stunning. I find it hilarious tho that for such a beautiful woman she makes the least feminine, deep throated grunt when she hits the ball. And you know she could kick your ass!