Paul Merson previews England's World Cup last-16 showdown against Mexico at the iconic Azteca stadium, calling it a genuine toss-up. England's narrow 2-1 victory over DR Congo in Atlanta, secured by Harry Kane and Anthony Gordon goals, sets up Monday's high-stakes encounter in Mexico City.

Mexico's formidable home record at the venue - unbeaten in World Cup matches and victorious in 70 of 89 competitive games - provides a significant advantage. The 7,200ft altitude presents England's biggest challenge, with Merson noting players typically need weeks to acclimatize properly. England's brief two-day preparation window in the Mexican capital leaves them vulnerable to the physical demands of high-altitude football.

Merson praised Kane's match-winning double against DR Congo, describing his second goal as 'phenomenal' and suggesting the striker belongs in the Ballon d'Or conversation if England advance deep into the tournament. Despite Mexico lacking players who would start for England, Merson believes the altitude factor makes this a 'heads-or-tails football match.'

Regarding selection issues, Merson favors retaining Djed Spence at right-back despite his struggles against DR Congo, citing pace as essential against Mexico's direct approach. He expects England to face intense pressure from Mexican players who 'just run teams down' in the closing stages.