Saudi Arabia beat two-time world champions Argentina 2-1 in the Group C match.
Despite Lionel Messi's goal, Argentina failed to win the match.
Saleh Alsehri scored for Saudi Arabia in the 48th minute and Salem Aldawsari scored in the 53rd minute.
With this defeat, Argentina's 36-match winning streak came to an end.
For the first time since 1974, Argentina conceded two goals in their opening match.
This was Saudi Arabia's third win in FIFA World Cups history.
Argentina will have to win both the remaining matches to reach the round of 16.