If you want to bet on that -190 favorite, you would risk $190 to win $100. If you envision the number 100 sitting between these two values, it is easier to understand how it works. Positive values such as +170 reflect MLB underdogs, while the negatives indicated favorite. When looking at MLB odds if you see negative values such as -110 in MLB betting lines, you’re looking at the favorite in a contest.
and the one we use here are American odds, which have lines that look like +200, -110, etc. There are decimal and fractional odds, but the most common MLB odds format.