The tournament begins with Mexico in Group A, a repeat of the 2010 opener remembered for Siphiwe Tshabalala’s first goal of that tournament. The 2026 edition opens the competition on the same ground, with both teams having qualified from difficult groups and neither carrying the status of clear favourite to top their section.
The second listed Group A fixture is Korea Republic vs Czechia, giving the section two early results before most other groups begin. Two Group A matches on the first day mean the section develops earlier than most of the tournament, and those results can influence how teams approach the next round of fixtures.
The opening day of a World Cup under the new 48-team format carries more significance than previous editions because the third-place qualification system makes early goal difference relevant in ways it has not been before. A team that wins its opening match by a wide margin can improve its goal-difference position early, which may matter later if third-place ranking becomes relevant.
Here is a summary of the opening day fixtures and the group context around them:
Both matches in Group A mean the section has its first two results before any other group has begun, giving it a head start on the overall standings picture.
The first five days of the tournament run from June 11 to 15 and cover the opening matches of almost all 12 groups. By the end of that window, every team will have played at least once and the group standings will have their first shape.
These are the storylines most worth tracking across the opening week:
The opening week will produce the clearest early information about which squads are genuinely prepared for deep tournament runs and which face more difficult paths than their seedings suggested.
Opening-round markets can move quickly because there is no current tournament form yet. Before kick-off, prices rely mainly on squad news, qualification results, recent friendlies and historical data. Once the match starts, that picture changes fast. A favourite that struggles in the first 15 minutes may drift in live markets, while an underdog that presses well, creates chances or controls possession can shorten before the first goal is even scored.
The markets most likely to move early are match winner, over/under and goalscorer. Over/under lines can react to tempo, early shots and defensive caution, while goalscorer prices often shift after lineups are confirmed. That is why opening-round markets are difficult to read from pre-match odds alone: the first few minutes can reveal more than a week of previews.