Mackenzie Dern has been taking a lot of heat for coming in way overweight for her bout tonight at UFC 224, but the prospect made short work of Amanda Bobby Cooper.

Dern, who weighed in at 123 pounds for the strawweight fight, dropped Cooper a couple of minutes in with a huge overhand right. After that, Dern took mount, and as Cooper scrambled, she sunk in a fight ending, rear-naked-choke.

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UFC 224

Mackenzie Dern def. Amanda Cooper via submission (rear-naked-choke) R1, 2:27
John Lineker def. Brian Kelleher via KO (punch) R3, 3:43
Lyoto Machida def. Vitor Belfort via KO (kick) R2, 1:00
Cezar Ferreira def. Karl Roberson via technical submission (arm-triangle-choke) R1, 4:45
Aleksei Oleinik def. Junior Albini via submission (ezekiel choke) R1, 1:45
Davi Ramos def. Nick Hein via submission (rear-naked-choke) R1, 4:15
Elizeu Zaleski dos Santos def. Sean Strickland via KO (wheel kick and punches) R1, 3:12
Warlley Alves def. Sultan Aliev via TKO (corner stoppage) R2, 5:00
Jack Hermansson def. Thales Leites via TKO (punches) R3, 2:10
Ramazan Emeev def. Alberto Mina via unanimous decision (30-27, 30-27, 30-27)
Markus Perez def. James Bochnovic via submission (rear-naked-choke) R1, 4:28