These odds are based on what is known as "A money line"
Money line betting is simply wagering on the contest based on a given price. In MMA this means the fighter wagered on has to win the fight outright.
* The minus sign (e.g.-130) always indicates the favorite and the amount you must bet to win $100.
* The plus sign (e.g.+120) always indicates the underdog and the amount you win for every $100 bet (you may wager more or less).
* Using this example, therefore, you would bet $130 to win $100 on the favorite, while for the underdog you would bet $100 to win $120.
In the context of this event
STEPHAN BONNAR is at -300. This means you will have to bet $300 to win $100 plus your stake
KEITH JARDINE is +250 this means you beton $100 to win another $250 plus your stake.
If the fight ends in a draw, no contest or it simply does not happen, you will get your money back. Good luck.