The co-hosts took control early and were rewarded in the ninth minute when Julian Quiñones capitalised on a turnover by Erik Lira, racing onto the loose ball before slotting through the legs of South Africa goalkeeper Ronwen Williams.
Mexico continued to dominate proceedings before the break. Quiñones struck the post with a low effort, while Bryan Gutiérrez missed another promising opportunity after being played through by the former atlas forward
South Africa forced to finish with nine men
South Africa’s hopes of mounting a comeback suffered a major setback shortly after halftime when Sphephelo Sithole was sent off for hauling down Gutiérrez as he ch
arged towards goal.
The contest became increasingly heated in the closing stages. Themba Zwane received a red card after being judged to have struck Alvarado in the face, while Mexico captain César Montes was also dismissed following a late challenge on Khuliso Mudau.
Despite the late disciplinary drama, Mexico secured all three points to begin their World Cup journey on a positive note, while South Africa were left to reflect on a frustrating evening that ended with nine men on the pitch.