As Week Four of The Ultimate Fighter 18 approaches, the tension among the contestants in the house is palpable. With several fighters already showing signs of cracking under the pressure, the stakes have never been higher. In this preview, we take a closer look at the matchups, the drama that’s unfolded so far, and what we can expect in the upcoming episodes. With friendships forming and alliances breaking, anything can happen in the world of TUF 18.