Conor McGregor UFC
Conor McGregor poses for photos during the UFC 229 Press Conference at Radio City Music Hall on September 20, 2018 in New York City. Steven Ryan/Getty Images

Conor McGregor returns to the octagon for the first time in nearly two years Saturday night when he challenges Khabib Nurmagomedov for the UFC lightweight championship in the main event of UFC 229. Not only is the biggest star in MMA history looking to become a two-time 155-pound champion, but he’s also hoping for the 10th victory of his UFC career.

McGregor enters the bout at Las Vegas’ T-Mobile Arena with a professional MMA record of 21-3. Ten of those fights have occurred in the UFC, and the Irish fighter has amassed a 9-1 record while competing in the world’s No.1 MMA promotion.

The only blemish on McGregor’s UFC career came in the main event of UFC 196 on March 5, 2016. Then the 145-point champion, McGregor jumped up two weight classes for a fight against Nate Diaz at 170 pounds. In a major upset, McGregor was forced to tap out to a rear-naked choke in the second round.

It wouldn’t be long before McGregor would get his revenge. He defeated Diaz by majority decision in their rematch at UFC 202 on Aug. 20, 2016. Less than three months later, McGregor headlined UFC 205 at Madison Square Garden, where he knocked out Eddie Alvarez in the second round to become the new lightweight champion.

By defeating Alvarez at 155 pounds, McGregor became the first UFC fighter to hold two separate championships at once. He was eventually stripped of both the featherweight and lightweight titles because he never defended them.

While it’s been 23 months since McGregor has competed in MMA, the 30-year-old did have a professional fight a little over a year ago. McGregor made his pro boxing debut on Aug. 26, 2017, losing to Floyd Mayweather by TKO in the 10th round. It was the second-highest selling pay-per-view of all time, and McGregor earned close to $100 million for the bout.

UFC 299 will mark the sixth UFC PPV that McGregor has headlined. He knocked out Chad Mendes in the second round of UFC 189 to become the interim UFC featherweight champion. Four months later on Dec. 12, 2015, McGregor needed just 13 seconds to beat Jose Aldo in the UFC 194 main event to become the unified 145-pound champion.

McGregor’s first loss as a pro MMA fighter came in Ireland on June 28, 2008 against Artemij Sitenkov by submission in Dublin, Ireland. It was McGregor’s third career fight. A year and a half later, McGregor was submitted by Joseph Duffy while fighting for Cage Warriors, a London-based MMA promotion, in his sixth career fight.

Nurmagomedov has a perfect 26-0 career MMA record, going 10-0 in the UFC. Five of his last seven wins have come by unanimous decision.