What he does worry about is keeping that belt at home in Cleveland, and he'll get a chance to add another successful defense to his record when he faces light heavyweight champ Daniel Cormier in the SuperFight that headlines UFC 226 in Las Vegas.
Lewis returns to action after scoring an impressive third-round TKO victory over Marcin Tybura at UFC Fight Night 126.
Watch UFC 226 on BT Sport 2The Miocic vs Cormier fight at UFC 226 will be aired live in the United Kingdom on BT Sport 2. Miocic would lose only once more - to Junior Dos Santos - before winning the heavyweight title against former champion Fabricio Werdum at UFC 198 in 2016. The coverage will start at midnight on Saturday with the main card title fight at 3am on the Sunday morning.
The undercard fights are expected to start around three hours before the main event, so be sure to tune in early if you want more MMA than just Miocic vs Cormier. For the most part, though, he just couldn't get it done against the better big men of the promotion. He's said UFC 226 will mark the first time he's truly happy with what his contract will pay him.
Wimbledon: Nadal to meet Russia’s Kukushkin in second round
Asked if he had any doubts about being fit for Wimbledon's third round, Queen's Club runner-up Djokovic said: "No". Their second-round match was halted by rain on Wednesday with Fabbiano leading 7-6 (7), 6-3, 5-6.
While Cormier is crossing off items on his limited to-do list before reaching his self-imposed retirement age of 40 next year, Miocic eagerly accepted the matchup for what will be the biggest payday of his UFC career. It was a master class from the champion, and one that went according to plan. "The last time I fought someone I was bigger than was Jeff Monson, that was in (2011) and I felt like Muhammad Ali out there (because) I had the reach advantage, the only time I've had the reach advantage". And when they do happen to find themselves in that kind of fight, they're prone to running out of gas. The heavyweight champ is listed as a -230 while Cormier is the +185 underdog.
Defending champion Miocic was typically unruffled by Cormier's comments when they were put to him during his media scrum later that afternoon. He lay on the floor for a few seconds before getting up and limping offstage.
In a sport where size definitely, matters, it's hard not to wonder whether there's any real way that Cormier is going to be able to overcome his size disadvantage when he steps into the octagon against Miocic on Saturday night in the main event at UFC 226. When he fought at heavyweight, and even more recently at light heavyweight, he's set a higher pace than his opponents wished to fight at, and eventually drowned them in it.