Guilherme Pat fights well on his feet, but is outmatched and loses his undefeated record at UFC Vegas 115.

Guilherme Pat in a UFC fight. Photo: Reproduction/Facebook/UFC

Guilherme Pat couldn't withstand the intensity of Thomas Petersen this Saturday (4), at ufc vegas 115, held at the Meta Apex in Las Vegas (USA). In a balanced duel, the American came out on top by forcing his grappling game in the decisive moments, especially in the third round, a determining factor in convincing the judges.

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In the first round, the Brazilian started better, connecting with two dangerous high kicks and controlling the distance with jabs and low kicks. Despite Petersen's pressure against the cage at times, Guilherme managed to defend well and kept the fight standing for most of the time, being more effective in the striking exchanges.

The second round followed a similar script, with Petersen looking for a grappling game and pressing against the cage, while Guilherme tried to respond in the center of the octagon with clean strikes. The Brazilian still landed some good attacks, including a powerful jab and low kicks, but was again blocked at crucial moments by his opponent.

In the third round, Petersen changed the course of the fight. More aggressive, he secured a takedown early on and began to dominate the Brazilian on the ground, landing punches and elbows from top position until the end of the fight. His control in the final round was decisive in securing the victory, while Guilherme Pat suffered the first defeat of his professional career.

With the defeat, Guilherme now has six wins and one loss in his professional record. The 31-year-old Brazilian was coming off a victory against Allen Frye in December 2025. This was his second fight for the organization. On the other side, Petersen updates his record to 12 wins and four losses. The American, who had lost in a duel against Victor PetrinoIn October 2025, he made his sixth appearance for the Ultimate Fighting Championship.

UFC Vegas 115 results

MAIN CARD

Light weight (up to 70,3 kg): Renato Moicano derrotou Chris Duncan by submission (rear naked choke) at 1m46sec of round 2

Straw weight (up to 52,1 kg): Virna jandiroba derrotou Tabatha Ricci by unanimous decision of the judges (30-27, 29-28, 29-28)

Light heavyweight (up to 92,9 kg): Abdul-Rakhman Yakhyaev defeated Brendson Ribeiro by finishing at 2m05sec of R1

Bantam weight (up to 61,2 kg): Ethyn Ewing derrotou Rafael Estevam by technical knockout (punch to the waistline) at 1:44 of round 3

Featherweight (up to 65,7 kg): Tommy McMillen defeated Manolo Zecchini by technical knockout (knee and punches) at 3:57 of round 1.

Featherweight (up to 65,7 kg): José Delano defeated Robert Ruchala by unanimous decision of the judges (30-26, 29-27, 29-27)

PRELIMINARY CARD

Heavy weight (up to 120,2 kg): Thomas Petersen derrotou Guilherme Pat by majority decision of the judges (28-28, 29-27, 29-27)

Flyweight (up to 56,7 kg): Alexander Costa derrotou Stewart Nicoll by technical knockout (punches) at 4:56 of R2

Light weight (up to 70,3 kg): Darrius Flowers derrotou Lando vannata by technical knockout (strikes) at 52 seconds of round 2

Bantam weight (up to 61,2 kg): Alice Pereira derrotou Hailey Cowan by knockout (knee strike) at 4:24 of round 2

Average weight (up to 83,9 kg): tresean gore derrotou Azamat Bekoev via submission (guillotine) at 3min27s of R3

Flyweight (up to 56,7 kg): Dione Barbosa derrotou Melissa Gatto by majority decision of the judges (28-28, 29-27, 29-27)

Light weight (up to 70,3 kg): Kai Kamaka III defeated Dakota Hope by split decision (29-28, 28-29, 29-28)