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A topped golf shot is caused by a player hitting the ball above its equator. Compare this to a thinned shot where the leading edge of the club face catches the ball below the equator but not low enough to make full contact.
Some players are able to manipulate a lob so that it appears the shot is overhit, but dips enough to fall within the baseline, often deceiving the opponent. This is created by generating a great amount of backspin, slicing or cutting the ball over the head of the other player.