Iran beat the U.S. in Group A while Brazil defeated Ukraine with a 2-1 score in Group B.
Group A includes Iran, Russia, Argentina, and the United States. Group B includes Ukraine, Brazil, Australia, and the Netherlands.
The seven-a-side tournament is being held in Ukraine from May 3 to 8. Iran is said to be among the favorite teams in the tournament.
The Iranian coach Amin Allahmani said prior to the tournament that his team is "well-prepared to win the title for the first time in history".