MMA remains one of the most unpredictable sports, and the main event of UFC on Fox 20 proved that theory, as Valentina Shevchenko defeated former UFC woman's bantamweight champion Holly Holm in impressive fashion. Checkout the twitter timeline below, as the pros react to Shevchenko's upset victory over Holm, Edson Barboza's three-round war with Gilbert Melendez, Felice Herrig's return to MMA competition, and much more.

Valentina Shevchenko def. Holly Holm

' @HollyHolm is a jacked white girl... I guess we need to get over it — Big Ben Rothwell (@RothwellFighter) July 24, 2016

I'm so nervous watching this — Randa Markos (@randamma) July 24, 2016

1-1? The weight advantage helping Holm in the clinch.....will she fade? — Coach Kavanagh (@John_Kavanagh) July 24, 2016

Volume being turned up. 1/1? #UFCChicago — The Spartan (@EliasTheodorou) July 24, 2016





1-1 these women r bringing it great technical fight @ufc #UFCChicago — Truck Gordon (@TruckMMA_UFC) July 24, 2016

Wow why won't this ref stand it up if Sevchenka won't strike. — Ben Askren (@Benaskren) July 24, 2016

Talk about not doing shit where is the stand up — ike vallie-flagg (@IKEVF) July 24, 2016

Come on ref! You gotta stand that up #UFCChicago — Cub Swanson (@CubSwanson) July 24, 2016

I think @HollyHolm needs a finish to win @BulletValentina is just perfect with the counters @ufc #UFCChicago — Truck Gordon (@TruckMMA_UFC) July 24, 2016

IDGAF what anyone thinks or thought about this fight. I think it's great and I am so inspired and learning so much. These women are awesome — Lauren Murphy (@LaurenMurphyMMA) July 24, 2016

The way Holly yells with every strike is unnerving. — Ben Askren (@Benaskren) July 24, 2016

Win or lose , I'm a fan of schevchenko. Great striking #UFCChicago — JIMI MANUWA (@POSTERBOYJM) July 24, 2016

What a great fight — Randa Markos (@randamma) July 24, 2016

— Julie Kedzie (@julesk_fighter) July 24, 2016

@HollyHolm you have all my love and respect always — Julie Kedzie (@julesk_fighter) July 24, 2016

Ohhh MMA — Derek Brunson (@DerekBrunson) July 24, 2016

This division is nuts. Anything can happen, and does. #UFCChicago — The Spartan (@EliasTheodorou) July 24, 2016

Love to watch a rematch w/ Shevchenko & @Amanda_Leoa both getting better every performance — Brian Stann (@BrianStann) July 24, 2016

I won the first fight with @BulletValentina by UD... if I fight her again I will beat her again, this time very clean.#UFCChicago @joerogan — Amanda Nunes (@Amanda_Leoa) July 24, 2016









Edson Barboza def. Gilbert Melendez

That was a beautiful first round. #UFCChicago — Dan Hardy (@danhardymma) July 24, 2016

Barboza chin man scary #UFCChicago — Jerome-Max Holloway (@BlessedMMA) July 24, 2016

I expect more kicks from barboza in rd2 — Coach Kavanagh (@John_Kavanagh) July 24, 2016

This fights getting goooood #UFCChicago — Cub Swanson (@CubSwanson) July 24, 2016

Dammit Giblert, keep him moving backwards — Julie Kedzie (@julesk_fighter) July 24, 2016

I would hate to be Gil's leg right now. #UFCChicago — The Spartan (@EliasTheodorou) July 24, 2016

Ooof — Julie Kedzie (@julesk_fighter) July 24, 2016

Fucking hell. Gilbert is a tough son of bitch so if he's showing pain you know Barbosa kicks hard — ike vallie-flagg (@IKEVF) July 24, 2016

I shriek every time Barbiza lands a leg kick — Lauren Murphy (@LaurenMurphyMMA) July 24, 2016

Great fight! — Coach Kavanagh (@John_Kavanagh) July 24, 2016

Anybody else would have quit. There's only one @GilbertMelendez — Chael Sonnen (@ChaelSonnen) July 24, 2016

My god, those men make violence into art — Julie Kedzie (@julesk_fighter) July 24, 2016

End of the 3rd it looked like @EdsonBarbozaJR backed off on the leg kicks because he knew he'd won & @GilbertMelendez will never quit. — Yves Edwards (@thugjitsumaster) July 24, 2016

Francis Ngannou def. Bojan Mihajlovic

Ngannou is a monster. Everyone is butchering his name though... EN-gah-noo! — Dan Hardy (@danhardymma) July 24, 2016

Let's be serious, fight was over before it started — Big Ben Rothwell (@RothwellFighter) July 24, 2016

Curled up in a ball = intelligent defence? — Coach Kavanagh (@John_Kavanagh) July 24, 2016

Is it @francis_ngannou or the French language which made that post fight interview seem so formal and elegant? #UFCChicago — Yves Edwards (@thugjitsumaster) July 24, 2016

I say we have Ngannou vs Derrick Lewis matched up pretty soon. #TheBeast vs #ThePredator — Dan Hardy (@danhardymma) July 24, 2016

Felice Herring def. Kailin Curran

Really impressed with @feliceherrig !!! — Julie Kedzie (@julesk_fighter) July 24, 2016

Huge finish for Herrig, needed that for her confidence and some momentum. Looked more confident on feet tonight too #UFConFOX — Brian Stann (@BrianStann) July 24, 2016

Happy for @feliceherrig. She's always been awesome to me. Smart head, too. #UFCChicago — Shayna Baszler (@QoSBaszler) July 24, 2016

It's ok @KailinCurran tonight wasn't your night but I know you'll be back stronger and better!! Hawaii still behind you all the way!! — Brad Tavares (@BradTavares) July 24, 2016

Felice really looked good tonight. I didn't expect that performance #UFCChicago — Cub Swanson (@CubSwanson) July 24, 2016

Very nice finish for @feliceherrig She took the back like an expert. Congrats @ufc #UFCChicago — Big Ben Rothwell (@RothwellFighter) July 24, 2016

Darren Elkins def. Godofredo Pepey

This fight is proof that ground fighting doesn't have to be boring. #UFCChicago — Dan Hardy (@danhardymma) July 23, 2016

Fuck you Pepey. Let's know him out bro! Let's go!! pic.twitter.com/9aHSOg08o2 — Teruto Ishihara (@teruto_ko) July 23, 2016

That knee was so illegal even Bisping thought it was dirty. :) #UFCChicago — The Spartan (@EliasTheodorou) July 23, 2016

Pepey's illegal knee just erased everyone's memory of Olivera's ball shot #UFCChicago — Angela Hill (@AngieOverkill) July 23, 2016

I think elkins out of danger now...time to grind — Coach Kavanagh (@John_Kavanagh) July 23, 2016

Elkins sure knows how to win ugly #UFCChicago — Cub Swanson (@CubSwanson) July 23, 2016