re: Why can you tag up on a foul ball and advance?

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Correct if the ball is deep enough in foul territory and the outfielder has no chance of getting the runner at home after he tagged up he will let it drop with less than 2 outs every time.

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Would depend on the score in the game but I get your point. In football I've always wondered why a runner fights to get from the 11 or 12 yard line down to the nine or ten yard line. Go down just outside the ten yard and you have possibly eight more downs to score instead of four.