Muhammad Ali continues to deliver knockout punches. Only now he's doing it in the ad game.

Ali is center stage in a commercial for the new Porsche 911, in which we imagine what an Ali versus Ali fight would look like (yes, they're actors -- there's no real footage superimposed).

For good measure, Maria Sharapova and chess champion Magnus Carlsen are also seen going against themselves in their sport of choice, illustrating what the car company reminds us at the end of the spot: "Introducing the new Porsche 911. The only car that can beat the 911."

Kudos to Porsche for invoking the greatness of Ali to make its sales pitch. Do you have any idea how much sales would plunge if they did this ad with Lance Armstrong, Johnny Manziel, or anyone on the 76ers?