UFC 266 will feature a rematch that's 17 years in the making when Nick Diaz squares off against former welterweight champion Robbie Lawler.The first time they fought, Lawler still had hair, Diaz's younger brother Nate wasn't in the UFC yet and George W. Bush was the president of the United States. In their first go-round, the pair produced a classic UFC fight, with Diaz emerging victorious in astounding fashion.Liam@LiamHealy16There’s a 209 month gap between Lawler vs Diaz 1 and 2.2:54 AM · Sep 21, 2021133There’s a 209 month gap between Lawler vs Diaz 1 and 2. https://t.co/eZ30ObDBukFortunately, MMA fans will get to relive the nostalgic feud as Diaz and Lawler gear up for round two. Unlike this rivalry, however, some UFC classics aren't meant to have sequels due to a variety of reasons.With that in mind, here are five blockbuster UFC rematches that probably will never happen.#5. T.J. Dillashaw vs. Dominick Cruz (UFC Fight Night 81)UFC Fight Night: T.J. Dillashaw vs Dominick CruzDominick Cruz was stripped of the UFC bantamweight title after he suffered a string of injuries. In his absence, T.J. Dillashaw emerged as the division's top guy. He defeated Renan Barao to claim the title and then defended it against Joe Soto and in a rematch against Barao.After spending a few years on the sidelines, Cruz set out on a mission to reclaim the title he never lost in January 2016. Dillashaw found out who the real top guy in the 135-pound division was.Ring rust didn't appear to be an issue for Cruz, who returned like he never left in the first place. 'The Dominator' was still as quick and elusive as ever after recovering from a potentially career-ending injury. Ultimately, a split decision win put Cruz back on the mountaintop after recapturing the title.However, Cruz's second reign did not last very long. Up-and-coming Team Alpha Male star Cody Garbrandt dethroned Cruz after putting on the performance of a lifetime.UFC on BT Sport@btsportufc#OnThisDay Cody Garbrandt ended the reign of Dominick Cruz with an unbelievable performance at UFC 207.1:10 AM · Dec 31, 202073160#OnThisDay Cody Garbrandt ended the reign of Dominick Cruz with an unbelievable performance at UFC 207.https://t.co/snKLQ9Qy58But the hot potato game with the UFC bantamweight title wasn't over. In his first title defense at UFC 217, Garbrandt locked horns with training partner-turned-bitter rival Dillashaw. 'No Love' crashed and burned as fast as he rose through the ranks when Dillashaw defeated him in back-to-back outings to kick him out of the title picture once and for all.Damon Martin@DamonMartinTJ Dillashaw believes Dominick Cruz will retire rather than fight him againfoxs.pt/2ilnVvi#UFC #UFC207 @TJDillashaw2:53 AM · Dec 24, 201652TJ Dillashaw believes Dominick Cruz will retire rather than fight him againfoxs.pt/2ilnVvi#UFC #UFC207 @TJDillashaw https://t.co/3H2Vr0S1KIOf course, we know how this story goes. Dillashaw was suspended and stripped of the title after testing positive for EPO, while Cruz has moved on to focus on his career as a commentator. The two have never crossed paths since and probably never will given where they are in their respective careers.