Now that Shaquille O'Neal has announced his retirement, it's the perfect time to discuss where he ranks among the top center in NBA history. Ethan Norof, of, does just that, as he gives his list of the ten best big men.

Shaquille O'Neal

There certainly have been a lot of great centers in NBA history, and Shaq has to rank near the top, on any list.

When you have names like Russell, Abdul-Jabbar, Olajuwon, and Chamberlain, it's makes it a difficult task to rank them in any particular order.