Apparently he didn’t keep himself up-to-date on the latest most-wanted posters:

“He was low-profile and used real documents to enter the country because he thought that nobody was looking for him,” said [Luiz Cravo Dorea, head of international cooperation at the Brazilian Federal Police].

Mexican ‘drug lord’ arrested on way to World Cup match
Jose Diaz-Barajas arrested at Rio de Janeiro airport boarding flight to Fortaleza after booking ticket to Mexico match under his own name

Jose Diaz-Barajas, 49, was attempting to board a flight to Fortaleza, where Mexico was due to play hosts Brazil on Tuesday night, when he was arrested at Rio de Janeiro’s Tom Jobim airport on Monday.

Fifa had passed on information regarding Diaz-Barajas’s ticket purchases to Brazilian police following an Interpol arrest warrant, said Luiz Cravo Dorea, head of international cooperation at the Federal Police.

He entered Brazil over land from Paraguay (surprise surprise!) on June 11.