All of the following reasons are just plain hypothetical reasons. We have no proofs to back up most of them.
1. Dirty foot trick of Marquez. Did he or did he not intentionally step on Pacquiao's foot five times to make his foe off-balance? Please watch the video below.
2. Conversion of Pacquiao from a Roman Catholic to a born-again Christian. Even his mother claims that this is the best reason why his son lost!
3. Marquez bulking up using performance enhancement drugs - incredible muscle buildup in one year with the assistance of a tainted conditioning coach.
To be updated.... until this message is removed.