Episode No. 3 of “The Ultimate Fighter 26: A New World Champion” opens with fight preparation for Team Gaethje’s Montana Stewart , who fights Team Alvarez’s Ariel Beck in the third tournament bout later in the episode. No. 6 Stewart is a former standout amateur wrestler who, at 22, is the youngest of the 16 fighters in the tournament. She is a mother to a six-year-old, and despite her age, already has 10 professional bouts on her record.