Has anyone won World Superbike Championship & Moto GP Championship?

Question

I know Nicky Hayden came from World Superbikes and won Moto GP Championship last year but am not sure he has won a World Superbike Championship.

Answer 1

Nicky never raced the world superbike champioship. He ran a race or two in the U.S. round at laguna as a wild card, but not the whole series like Ben Bostrom did. Nicky was the AMA superbike champ, and went straight to MotoGP. To my knowledge, no one has won both World Superbike and MotoGP titles. Some WSBK champs have won MotoGP races, but not a title.