After scraping past DR Congo 2-1 to reach the last 16, England's next World Cup obstacle is one they cannot control – the 7,220ft altitude of Mexico City's Estadio Azteca.
The iconic stadium, where England last played in their controversial 1986 quarter-final defeat to Argentina, sits 14 times higher than West Bromwich Albion's The Hawthorns, the highest ground in professional English football at 551ft. The thinner air means less oxygen enters the bloodstream with each breath, causing increased heart rate, shortness of breath, dehydration and quicker, more intense fatigue.
“England must overcome 7,220ft altitude at Azteca Stadium, where Mexico have lost only twice competitively since 1966.”
Mexico have turned the Azteca into a fortress. Since they began playing there in 1966, their competitive record is 70 wins from 89 games, with 17 draws and only two defeats – against Costa Rica in 2001 and Honduras in 2013. They are also unbeaten in 10 World Cup matches at the venue, having played all their current tournament games on home soil. So far in the 2020s, they have scored 23 goals at the Azteca while conceding just four.
"As an opponent, you know when you go there, you are going to suffer," said Pavel Pardo, a former Mexico captain who played domestically for Club America.
Nigel Reo-Coker, the former West Ham midfielder who played in the 2015 Concacaf Champions League final at the Azteca for Montreal Impact, described it as "the most physically demanding place I ever played football". He added: "You cannot catch your breath. The first 45 to 55 minutes you're literally just trying to keep breathing. It's about football intelligence – you really have to pick and choose your moments where you exert yourself."
The thinner air also affects the ball, making crosses travel faster and changing tactical dynamics. Reo-Coker suggested yoga or pilates as preparation aids, though even with modern sports science, the impact remains significant.