The U.S. and Iran remain scoreless midway through the first half of a decisive Group B match in the World Cup, but the U.S. has had the majority of chances so far.

The U.S. had 60% of possession, four shots and two shots on goal in the first 30 minutes. Iran, meanwhile, has yet to attempt a shot.

England and Wales also remain in a 0-0 draw through 30 minutes.

The second set of matches of the day are underway in Qatar with the U.S. men's national team facing a must-win against Iran.

The U.S. can only advance to the knockout stage with a victory after draws against Wales and England. If they lose, the U.S. team heads home.

For Iran, who defeated Wales but was dominated by England, a win or a draw can move the team to the knockout round.

In the other match, between England and Wales, Wales can only advance with a win against England, a draw from U.S.-Iran and a lot of help in goal differential. England is likely to advance as it stands as the top team in Group B and could advance even if it ties with Wales.

The first two teams to advance out of group play are Senegal and Netherlands. Netherlands cruised to a 2-0 victory over host country Qatar, while Senegal earned a 2-1 victory in a must-win match.

Senegal led 1-0 at the half on a penalty kick goal from Ismaila Sarr in the 44th minute. But Ecuador tied the game 1-1 in the 67th minute on a goal by Moises Caicedo off a corner kick. A draw would've meant Ecuador advanced to the knockout round.

But Senegal's Kalidou Koulibaly scored the go-ahead goal just three minutes later off a free kick. The goal stood up as the game-winner.

A heavily favored Dutch side had no issues with Qatar, which had already been eliminated from contention for the second round. Cody Gakpo scored in the 26th minute and Frenkie de Jong added a second goal just four minutes into the second half. Netherlands finished atop the group with the win.

Netherlands will play the second-place team in Group B in the next round, while Senegal will face the winner of Group A. The U.S., if they advance over Iran, will likely take on Netherlands.

Senegal and the Netherlands hold one-goal leads at the half in the final matches in Group A.

Senegal, which likely needs a win to advance, scored a goal on a penalty kick by Ismaila Sarr in the 44th minute. Senegal leads Ecuador, 1-0. Ecuador needs a win or draw to advance to the knockout stage.

The Netherlands has had no problems with the host country of Qatar in the first half, leading 1-0 behind a goal from Cody Gakpo in the 26th minute. A win would put the Dutch into the second round.

Denmark, one of the sleeper picks to win the tournament, settled for a 0-0 draw with Tunisia in their first game in Group D. It was the first scoreless draw of the tournament and only the second draw -- after the U.S.-Wales on Monday.

The Danes are ranked 10th in the world, while Tunisia is ranked 30th.

Denmark held its collective breath in the 93rd minute when the referee was called over to look at VAR for a hand ball, but the ruling came back with no penalty.