Javier Hernandez scored a milestone goal as Mexico marched towards the World Cup knockout stages with a 2-1 win over South Korea in Rostov-on-Don.
Arsenal outcast Carlos Vela had put Germany's surprise conquerors ahead with a 26th-minute penalty and West Ham forward Hernandez sealed a second successive victory for Mexico in the 66th minute, reaching 50 international goals in the process.
Tottenham's Heung-Min Son struck back in injury-time for South Korea, finding the top corner with his left boot (90+3), but it proved a mere consolation with both sides' fate close to being sealed.
Mexico were later denied a guaranteed place in the last 16 after Germany beat Sweden in injury time in Group F's evening encounter, a result which also kept South Korea - now beaten in both their games - still in the competition, albeit only just.
Juan Carlos Osorio resisted the urge to tinker too much after a famous opening victory that had left Hernandez in tears, but Mexico were shackled by a string of robust challenges in a scrappy start.
Hernandez headed high and wide from a 12th-minute free-kick but, just moments later, South Korea were denied by a crucial defensive intervention from Mexico's match-winner against the world champions.
Hee-Chan Hwang broke down the right but as Yong Lee shaped to meet his cross at the back post, Hirving Lozano threw his body in the way.
Son was thwarted three times - by desperate blocks and then a deflection - as the pace picked up, but Mexico seized advantage from the spot when Hyun-Soo Jang went to ground with his arm raised as Andres Guardado centred.
Son's pace continued to cause problems as his team-mates launched balls over the top, but goalkeeper Guillermo Ochoa was rarely tested and Lozano, dropping his shoulder to drift between red shirts, might have doubled Mexico's lead by the break.
Lozano struck wildly again soon after the restart, while up the other end, South Korea's calls for a penalty when Seon-Min Moon's shot struck Carlos Salcedo were given short shrift.
Guardado forced Hyeon-Woo Cho into a diving save and Vela went close again, the game increasingly stretched as South Korea sought an equaliser, but breathing space finally came midway through the second half.
Lozano drove goalwards following a swift break and Hernandez, beautifully balanced, cut inside to leave Jang on the turf before finding the back of the net.
Ochoa and substitute Rafael Marquez might have gifted South Korea a lifeline as they carelessly swapped short passes with Son lurking, but the damage had been done in the other box and Mexico's travelling hordes danced with joy.
The game had meandered towards its end but Son's quality finally showed at the death, even if it counted for nothing.
The group picture will become clearer after Germany's clash with Sweden but Mexico will seek to clinch top spot when they face the Swedes in Ekaterinburg on Wednesday, with South Korea tackling Germany at the same time of 3pm in Kazan.