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How does Vegas set odds on who will win a one-on-one battle like a UFC fight? MMA lines are usually moneylines (much like hockey or baseball) where you pick one fighter to win. However, Vegas requires you to risk more to back the favorite while rewarding you with a bigger payout for backing the underdog. The UFC fighter must win the fight to win the wager. You will read negative and positive values on MMA odds. The favorite is marked with a negative value (-150) and the positive value indicates the underdog (+130). It’s easiest to understand by placing the number 100 middle of these two values. -150 | 100 | +130 For example, if you want to bet on an MMA fighter listed at -200, you would wager $200 in order to win $100. In smaller increments, you would risk $20 to win $10. On an MMA underdog listed at +170, you would risk $100 and win $170 if the underdog wins. Again, smaller wager sizes would see you risk $10 for the chance at a $17 profit. Other forms of MMA odds include over-under rounds (will the fight last longer than 2.5 rounds or be over before then) are often available close to fight night (more on that from OddsShark.com). Other forms of wagering include MMA props, where Vegas may offer odds on who will win the first round or whether the fight will end in a knockout, decision, submission, or disqualification.