Nah, that's just a joke I've read from Talk Tennis forum.
Caroline Wozniacki, the WTA world no.37, in her blog, denied dating Rafael Nadal.
"I saw from a lot of newspapers and on the internet that people start talking that I’m dating Nadal. But this is NOT true. We have never been together. The speculation that we were together in Miami is also false. I’m 17 years old, and for the moment Tennis is my main priority."Hope that quash the rumour.
*Updates! Rafael Nadal's girlfriend revealed here.