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When there are runners at all the bases, first, second, and third, and the current batter hits a home run. This clears the bases driving in all the players as well as the batter for a total of 4 runs scored.

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โˆ™ 2011-01-13 23:50:26
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Q: What is grandslam in baseball?
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Grandslam Entertainment was created in 1987.

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