Total bases refer to the number of bases gained by a batter through his hits. A batter records one total base for a single, two total bases for a double, three total bases for a triple and four total bases for a home run.
Total bases are used to determine a player's slugging percentage -- which is total bases divided by at-bats. A player can only add to his total-bases tally through a hit. Advancing on the basepaths -- even via a steal -- has no impact on a player's total bases.
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