I think that Thalmor have their neat magicks and I think that their mages could beat Dragonborn so...
Nah, from personal experience their magic is limited, and I've withstood some pretty fierce mage attacks. After a while, the Dovahkiin's resistance is even more legendary than his fighting ability. Magic won't do it. To defeat the Dragonborn would require brains, wile, wit, cunning and subterfuge, knife in the back by a trusted friend. Of course, the Dragonborn doesn't really have any friends, he has people who want to use him for their own goals, to control him, or are "sworn to carry his burdens," so that might be tricky to pull off.