The knockout stage of the 1930 FIFA World Cup was played between 26 July and 30 July 1930. The semi-finals were played on 26 July and 27 July, with two rest days before the final on 30 July.
1930 FIFA World Cup knockout stage Wikipedia
According to the format of the tournament, the 13 participants were divided into four pools. The winner of each group would progress to the semi-finals knockout stage.
The four teams that qualified for the semi-finals were Argentina, Uruguay, United States and Yugoslavia. Since there were no predefined brackets, a draw took place in July 23 to decide the semi-final meetings. Hosts Uruguay were drawn to play Yugoslavia. Argentina and the United States would contest the other semi-final.
The match was even until American center-half Raphael Tracey was injured in the 19th minute. Soon after, Argentina scored the opener with their own center-half, Luis Monti. Tracey left the game at half-time and, since no substitutions were allowed at the time, the United States had to play the second half with 10 men. They also saw goalkeeper Jimmy Douglas hurt his shoulder 15 minutes into the second half. The Argentines scored five more times and went on to win the match, becoming the first team qualified for a World Cup final.
Yugoslavia opened the score in the 4th minute with Đorđe Vujadinović and had a disallowed goal in the 9th. The Uruguayans made a recovery and Pedro Cea equalized. They took the lead still in the first half with two more goals. In the second half, the host nation sealed the result three more times, and Cea completed a hat-trick. The Yugoslavs heavily contested refereeing decisions on the third and fourth Uruguayan goals, but to no avail. Uruguay advanced to the final in home soil.