Thomas Petersen, a mixed martial artist, has competed in the UFC with an MMA record of 10-4-0 and a UFC record of 2-3-0. Weighing 264 lbs., he stands at 6' 1' tall with a reach of 74'. In his southpaw stance, Petersen demonstrated a significant striking rate of 3.38 per minute in the UFC, landing strikes accurately 58% of the time while absorbing an average of 2.95 strikes per minute. His strike defense was at 55%, and he averaged 3.71 takedowns every 15 minutes with a takedown accuracy of 50%. Submission attempts were rare for Petersen, averaging only 0.5 per 15 minutes. One of his most notable victories came against Mohammed Usman, who had an ELO rating of 1032. In terms of recent fight history, Petersen competed in five fights, starting with a unanimous decision loss to Jamal Pogues in February 2024. He then achieved a unanimous decision victory over Mohammed Usman in July 2024. The following year, he suffered a knockout/technical knockout loss to Shamil Gaziev before winning another unanimous decision against Don'Tale Mayes. In October 2025, Petersen faced Vitor Petrino and lost via knockout/technical knockout.