Alexa Grasso shocked the world in 2023.

At UFC 285, Grasso (16-5-1 MMA, 8-5-1 UFC) entered her first women's flyweight title bout as a massive underdog against Valentina Shevchenko. The fight was title defense attempt No. 8 for Shevchenko (26-4-1 MMA, 15-3-1 UFC), who entered as a -900 favorite to continue her title reign.

Grasso had other plans, though.

Grasso started the fight strong, winning the first round on all three judges' scorecards. However, the next two rounds saw the champion settle in and begin to pull away. Then, Round 4 saw lighting strike.

Shevchenko offered a spinning back kick that missed the target, and Grasso quickly capitalized by jumping on her back and sinking in a tight rear-naked choke. Shevchenko was trapped, and frustratingly tapped out when she realized there was no way out.

You can watch Grasso's unforgettable championship moment in the video above.

Grasso returns to action in the co-main event of UFC Fight Night 271 at Climate Pledge Arena in Seattle. She takes on Maycee Barber in a rematch from their first meeting at UFC 258 in 2021, which Grasso won by unanimous decision.

This article originally appeared on MMA Junkie: UFC full fight video: Grasso submits Shevchenko for gold