Kicking off the promotional tour of his bout with Floyd Mayweather in the summer of 2017, McGregor wore a spiffy pinstripe suit which, upon closer review, revealed the pinstripes to be made by lines of the phrase "F*** You." McGregor's return was a success, as he finished off American Donald "Cowboy" Cerrone with a 40-second TKO - the second-fastest win of his career, and his first victory in more than three years. However, later in the year the fighter confirmed that he intended to make a comeback in January 2020. On March 26, 2019, McGregor announced via Twitter that he was retiring from the sport that made him famous, concluding his MMA career with a record of 21 wins and four losses. Right after Nurmagomedov's fourth-round win, the two sides erupted in a post-match brawl, resulting in a six-month suspension for McGregor. McGregor made his long-awaited return in October 2018, nearly two years after his last UFC fight, to challenge the new lightweight champ, Khabib Nurmagomedov. McGregor's relationship with the UFC became strained when his inactivity in the octagon prompted its president to strip the fighter of his featherweight and lightweight titles by early 2018. This time he rebounded to win the crucial fourth round and held on through Diaz's desperate late flurry to win the instant classic by majority decision. In their much-anticipated rematch that August, McGregor again jumped out to a fast start before the tide turned. The Irishman was eventually worn down by the bigger Diaz before submitting to a chokehold, ending his 15-match winning streak.
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When lightweight champion Rafael dos Anjos pulled out of their planned March 2016 title bout due to injury, McGregor jumped one more weight class to fight Nate Diaz at 170 pounds. That December, he knocked out Jose Aldo in a record 13 seconds to unify the featherweight title. He continued his winning ways through July 2015, when he defeated Chad Mendes for the interim featherweight title. Signed by UFC President Dana White in early 2013, McGregor impressed with a first-round knockout in his April debut for the organization. He lost two of his first six fights before reeling off an impressive winning streak, claiming both the featherweight championship and the lightweight championship in 2012.
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McGregor made his professional debut on March 8, 2008, for the London-based promotion Cage Warriors, winning by TKO.