Eugene, Oregon might be the place to be on March 4, 2011 for “Clash of the Champions” exhibition between Nadal and Federer. Another charitable exhibition pitting the best in the tennis world. Also playing are Sharapova and Serena Williams. A mixed doubles exhibition with all four players will be sandwiched between the women’s singles and the men’s singles. Whew! That’s a lot of high class tennis. Check out the details here.