The people who put together the mega-fight between Floyd Mayweather Jr. and Manny Pacquiao had a special Cinco de Mayo gift for Latino boxing fans: a finger in their eye. I can’t believe the organizers and promoters — which included Top Rank Inc., Mayweather Promotions, Showtime and HBO — arranged to have someone sing the Mexican national anthem before Saturday’s bout. At least there was no sombrero.