Notorious

Within three years of joining the UFC, the Dubliner McGregor had accomplished more than any fighter in the promotion's two decades of existence. He began as an unknown prospect and went on to become the first man to hold two world titles at once. Knockouts marked his climb through the featherweight and lightweight ranks, and his rise jolted the wider world.

His path was anything but easy. Before any of that, he was a teenager swapping martial arts moves with his friends, chasing an ambitious dream that offered little guarantee of payoff. Hardly anyone could have predicted that he would become the most lucrative pay-per-view draw on the planet.

This is not the story of a gifted athlete handed a clear route to the top. It follows a young man whose stubbornness and unshakeable inner drive reshaped the sport itself.