re: Which is harder to do.....

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Is the tennis ball coming straight for me or do I have to chase it down on the court?

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The serve would obviously have to be "in", but you still might have to move around to get a racquet on it. Returning a serve, you would only have to worry about covering half the court as well as "out wide" of that respective half. So you have roughly about a 20ish ft wide area to defend.