#1 Goldberg
No wrestler could deliver the spear the way Goldberg used to. He used to run and almost carry his opponent and make them fly to a distance while delivering the move. This caused more brutal effect and it was just the beginning of the end of his opponents. The spear used to be followed by the jackhammer and then no wrestler could beat the count of the referee.
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Goldberg was undefeated for a long span of time in WCW and later in the WWE. Whether it is singles competition or handicap match, he could size up all of his opponents with one spear. This is simply because no player, irrespective of his size could absorb his deadly spears, which used to blow the air out of their body. He is undoubtedly number one on this list, as he grabbed the mammoth amount of success owing to this decimating move of his.