Rosberg challenges Ecclestone on 'boring' tag

By Alan Baldwin MEXICO CITY (Reuters) - Nico Rosberg has had words with Bernie Ecclestone after Formula One's commercial supremo indicated the German might make a boring world champion. "I spoke to him personally and he said that's not exactly the way he said it," Rosberg told reporters at the Mexican Grand Prix, revealing a rare moment of sensitivity to what was being written about him. For me, I focus on my thing and that's it." Ecclestone had said at last weekend's U.S. Grand Prix that Rosber