The "total bases" prop bet is a matchup between two players on opposing teams in the same game, where you are betting on which player will have more total bases in the game. Bases are awarded on hits only, as follows: Single = 1 base. Double = 2 bases. Triple = 3 bases.
A Total bases bet is one of the more popular bets for hitters. This allows you to bet on how many total bases the batter will earn in a given game. A batter is only credited for total bases if he hits a single (one base), double (two bases), triple (three bases), or home run (four bases) so walks do not count.