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McGregor is a former Cage Warriors featherweight and lightweight champion. In 2015, at UFC 194, he defeated José Aldo for the UFC Featherweight Championship via knockout 13 seconds into the first round, which is the fastest victory in UFC title fight history. Upon defeating Eddie Alvarez for the UFC Lightweight Championship at UFC 205, McGregor became the first fighter in UFC history to hold titles in two weight divisions simultaneously.