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

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I think it takes more control to return the serve but I would think a tennis ball easier to hit than a 90 mph baseball.

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Pro tennis serves can get up in the mid 100s.

I'm going with hitting the baseball as easier. Because most people have played baseball at some point in their lives and have a decent enough grasp on the mechanics that they could at least put the ball in play if they get contact.