Was Mayweather's Victory Over Ortiz Unsportsmanlike?

Last night Floyd "Money" Mayweather added another victory to his impressive record (he is now 42-0-0) by knocking out Mexican-American fighter Victor Ortiz.

The fight proved to be controversial because during the 4th round, Ortiz intentionally headbutted Mayweather during the round.

Mayweather complained about the headbutt and the referee docked Ortiz a point because of it. What happened next has sent ripples of debate in the boxing world.

Mayweather took advantage of an apologetic Ortiz and knocked him out (see attached video). Afterwards, Mayweather would defend his victory by saying "It's protect yourself at all times."

Ortiz learned a lesson that night. Mayweather earned another victory.