Lots of great Mexican fighters over the years. Sanchez, Chavez, Lopez, Morales, Barrera, etc.

But has any Mexican fighter ever beaten a fighter of Mayweather's caliber? I say no. Chavez failed in his chance against Whitaker. Sanchez beat Azumah Nelson, but at a time when Nelson was very young and unknown. Morales beat Pacquiao, but at a time when Pacquiao wasn't considered an all-time great like he is now.

So, would it be the biggest win ever by a Mexican fighter?

Discuss.