#1 Brock Lesnar
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Brock Lesnar without a shadow of a doubt had the best debut year in the company's history. Lesnar won King of the Ring, WWE Undisputed Championship and the Royal Rumble in his very first year. The Next Big Thing was set to be company's next megastar after Stone Cold Steve Austin and The Rock. However, that wasn't meant to be.
Brock left the company after his defeat to Goldberg at Wrestlemania XX. Of all the wrestlers mentioned in this list, The Beast's departure was the worst for the company. Lesnar decided to leave just after 2 years to try his luck in the National Football League. He also wasn't a big fan of WWE's hectic schedule.
Considering what Lesnar had achieved in a mere 2 years, it would have been very interesting to see how things would have unfolded if he had never left.
Major rumor about recently released stars HERE