#4 Booker T - King of the Ring 2006
Booker T became King Booker after defeating Bobby Lashley during the King of the Ring tournament in 2006.
His career has reached new heights since then. In the same year at The Great American Bash, Booker defeated Rey Mysterio to win his first WWE World Heavyweight Championship.
On earning his maiden world title in WWE, Booker proclaimed himself as 'The King of the World'. The title win would also make King Booker the sixteenth Triple Crown Champion and eighth Grand Slam Champion in the history of WWE.
#3 Brock Lesnar - King of the Ring 2002
Brock Lesnar made his WWE debut in March 2002, and in June, he won the King of the Ring by beating Rob Van Dam.
One surely knew, looking at The Beast in 2002, that he was cut for big things. After winning the tournament, Lesnar beat The Rock at SummerSlam to become the Undisputed WWE Champion at 25, making him the youngest champion.
Lesnar also became the second-fastest superstar to win the WWE Championship in 126 days after making his debut. Since then, The Beast Incarnate has gone on to become one of the best in WWE.