The Houston Texans and Oakland Raiders had more than each other to contend with in the latest edition of Monday Night Football. First, there was the high elevation of Mexico City — over 2,000 feet higher than the NFL’s highest city of Denver. Then there was the air pollution, the unfamiliar Azteca Stadium, and its sold-out crowd of nearly 90,000 screaming fans. While international NFL games in the United Kingdom have become an annual event, Mexican fans had to wait a while to see the sport they love. Monday’s contest was just the second ever in Mexico and the first since 2005. But now the NFL is back with a three-year contract for games in the Azteca, and the league hopes to make it a yearly event. It appears Mexican fans are ready for more football, as Monday’s game sold out almost instantly. And it helped that the game was a thriller, as the Raiders used two fourth-quarter touchdowns to top the Texans 27-20.