UFC Argentina results: Johnny Walker rocks Khalil Rountree in first-round KO

Johnny Walker def. Khalil Rountree at UFC Fight Night 140: Best photos

Johnny Walker (15-3 MMA, 1-0 UFC) made quite the impression in his UFC debut, using a devastating clinch attack to stop Khalil Rountree (7-3 MMA, 3-3 UFC) in the first round.

The light heavyweight contest took place on the FS1-broadcast main card of Saturday's UFC Fight Night 140 event at Parque Roca Arena in Buenos Aires, Argentina.

Both men were light on their feet to start, with the much taller Walker looking to stay at range but striking a very wide stance. Rountree opened with a kick to the thigh, and Walker taunted him with a sad face while rubbing the limb. Once they engaged again, Walker worked in a high kick that partially landed and a few punches that followed. Walker pushed forward and wrapped his arms around the head, controlling the action. As they worked from the clinch, Walker landed a few short elbows, including a devastating shot that sent Rountree crashing to the canvas. A few punches on the floor sealed the brutal finish at the 1:57 mark of the first round.

"I'm really happy," Walker said after the win. "The fight went well for me. I train a lot, always focused and dedicated. I don't drink, I don't smoke, I don't go to clubs. So, the result has to be this one or even better. It will always be like this until I get my two belts: light heavyweight and heavyweight."

Up-to-the-minute UFC Fight Night 140 results include:

• Johnny Walker def. Khalil Rountree via knockout (strikes) – Round 1, 1:57
• Ian Heinisch def. Cezar Ferreira via unanimous decision (30-27, 29-28, 29-28)
• Marlon Vera def. Guido Cannetti via submission (rear-naked choke) – Round 2, 1:31
• Cynthia Calvillo def. Poliana Botelho via submission (rear-naked choke) – Round 1, 4:48
• Michel Prazeres def. Bartosz Fabinski via submission (guillotine choke) – Round 1, 1:02
• Alexandre Pantoja def. Ulka Sasaki via submission (rear-naked choke) – Round 1, 2:18
• Austin Arnett def. Humberto Bandenay via unanimous decision (29-28, 29-27, 29-27)
• Laureano Staropoli def. Hector Aldana via unanimous decision (30-27, 30-27, 30-27)
• Jesus Pinedo def. Devin Powell via unanimous decision (29-28, 30-27, 30-27)
• Nad Narimani def. Anderson dos Santos via unanimous decision (30-27, 30-27, 30-27)

For complete coverage of UFC Fight Night 140, check out the UFC Events section of the site.