Rafael dos Anjos' title reign came to an abrupt end Thursday night as challenger Eddie Alvarez scored a first-round TKO in the main event of UFC Fight Night to walk away UFC lightweight champion.

Alvarez pushed a fast-and-furious pace, which dos Anjos matched, but was able to catch the Brazilian with a big straight right hand that sent his opponent stumbling backwards.

RDA survived for as long as he could, but Alvarez kept pouring it on until Herb Dean stepped in and called an end to the fight.

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RDA looked sharp until he got caught with that big shot 😳 #ufcvegas

— Cub Swanson (@CubSwanson) July 8, 2016

UFC fighters took to Twitter to react to the crowning of a new UFC champion.

Wow

— Anthony Pettis (@Showtimepettis) July 8, 2016

Congratulations Eddie, hold on to that belt for a little while... I want to be the one to take it. #believeit

— Will Brooks (@illwillbrooks86) July 8, 2016

AAAAANNNNDDDDD NNEEEEEWWWWWW @ealvarezfight ! 1 down 1 to go!! @frankieedgar up next...… https://t.co/XEuW1CFYgH

— Corey Anderson UFC (@CoreyA_MMA) July 8, 2016

. @Ealvarezfight Right hook around the guard of RDA ala Mayweather vs Cotto

— Zachary Makovsky (@ZachFunSize) July 8, 2016

This is crazy Bisping and Eddy Alvarez are now World champion. That's what hard work and persistence gets you. ANYTHING IS POSSIBLE!

— James Vick (@JamesVickMMA) July 8, 2016

@Ealvarezfight family man!!! Way to go dude! Congrats! #ufcphilly #letsdoit

— Paul Felder (@felderpaul) July 8, 2016

NOBODY has my kinda power.
Uppercut- it only takes me one. #UFCVegas

— Jeremy Stephens (@LiLHeathenMMA) July 8, 2016

Congrats! To the new champ @Ealvarezfight solid!!

— Michael Johnson (@FollowTheMenace) July 8, 2016

WOW @Ealvarezfight so proud and happy for you !!! Remembering those days we were starting our careers on the same cards..

— Big Ben Rothwell (@RothwellFighter) July 8, 2016

Wow! This is gonna be a great week of fights! #UFCVegas

— Derek Brunson (@DerekBrunson) July 8, 2016

Holllyyyy shhhiiitttt #UFCFightWeek

— Jerome-Max Holloway (@BlessedMMA) July 8, 2016

#ufcvegas was fun. New lightweight champ. Congrats! @UFCFightPass rocks

— Mickey Gall (@mickeygall) July 8, 2016

The #undergroundking does it! The heart of a champion. #muchrespect the dog came out!

— Frankie Saenz (@FrankieSaenz) July 8, 2016

@RdosAnjosMMA never give up.

— Antonio Pezao Silva (@BigfootSilva) July 8, 2016