Khamzat Chimaev has fumbled the biggest opportunity of his career.
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The Ultimate Fighting Championship was slated to return to the T-Mobile Arena in Las Vegas with a highly anticipated welterweight clash between Chimaev and Nate Diaz, but that has now changed. Weight concerns plagued many competitors ahead of UFC 279, and even though only three officially missed weight, one of the most important players tipped the scales way over the limit. As a result, the final three bouts of the evening have changed, with new matchups in each. Now, Diaz will fight in the five-round main event against Tony Ferguson.Despite losing his last two fights, and with his last win coming in 2019, Diaz (20-13) finds himself in another pay-per-view main event. The fan-favorite fighter from Stockton, Calif., is on the last fight of his UFC contract and will…