Porter Mayberry Is The Shortest Professional Dunker in the World! 5’5″8 Comments Standing only 5’5 is not a excuse for Porter Mayberry not dunking on your head. This man can JUMP. His vertical is off the charts (somewhere between 45-48 inches). The montage of dunks shown here shows that despite being the one of the smallest human beings ever to dunk a basketball, he’s also among the best.