Day 12 of the FIFA World Cup 2026 features a Group J match between Argentina and Austria at the Dallas Stadium. Multiple reports describe the fixture as the headline game scheduled for the day, with Argentina’s Lionel Messi expected to be in action. The coverage frames the match as part of the tournament’s ongoing group-stage schedule, with both teams competing within Group J. The reports agree on the basic match details: the opponent matchup (Argentina vs Austria), the group (Group J), and the venue (Dallas Stadium). They also align on the broader context that Day 12 includes the Argentina-Austria encounter as a key event and that it is highlighted in part because of Messi’s participation. No additional match outcomes or standout incidents are provided in the supplied summaries, so the focus remains on the scheduling and fixture information for the day’s event.