An over/under tip constitutes a bet on a number of particular in-game events being greater or smaller than a given margin. The most basic example is a total of over/under 2.5 goals, which depends on the number of goals being three and more (over 2.5) or two and less (under 2.5). Under over predictions are top 2 by popularity among sports bettors across the world. They are universal and are offered for football, tennis, basketball, cricket, rugby, American football, etc.