Women's World Cup O'Reilly was a key member of USA's U-19 winning team, scoring four goals and created seven. This helped the USA youth to win their first World Championship ever for this level. 2004 Athens Olympics After recovering from a broken fibula from a match the year before, O'Reilly made the national team roster for the 2004 Summer Olympics in Athens. At nineteen years old, she was the youngest player on the roster. On August 23, 2004, she scored the match winning goal in the Olympic semi-final match against Germany, propelling the United States into the final, in which they defeated Brazil for the gold medal. 2007 FIFA Women's World Cup In the 2007 FIFA Women's World Cup, O'Reilly scored a critical goal against North Korea in the 69th minute, which tied the match at 2–2 and saved the Americans from a devastating opening-round loss. The United States ended up taking the bronze medal, with O'Reilly scoring a goal during the 4–1 win against Norway. She was nominated as Sports Illustrateds 2007 Sportsman of the Year. 2008 Beijing Olympics O'Reilly competed at the Beijing 2008 Summer Olympic games. She scored the quickest goal in Olympic women's soccer history against New Zealand to advance to the quarterfinals. She also scored a goal in the semi-final match against Japan. The team went on to defeat heavy-favorites Brazil 1–0 to win the gold medal. Prior to the Summer Games, Time magazine ranked her number 15 on its list of 100 Olympic Athletes to Watch. 2011 FIFA Women's World Cup O'Reilly was selected for the 2011 FIFA Women's World Cup and in the second match of the group stage scored the first of three goals for USA against Colombia. 2012 London Olympics At the 2012 Olympics in London, she made a crucial assist in the 123rd minute of the semi-final match against Canada, sending a cross from the right to Alex Morgan who headed the ball into the goal over the hand of Erin McLeod, propelling team USA to the gold medal match against Japan. 2015 FIFA Women's World Cup O'Reilly was selected for her third World Cup in 2015. She did not appear in any games during the tournament but became a World Cup Champion on July 5, when the United States defeated Japan 5–2 in the Women's World Cup final. O'Reilly joined the national team on a Victory Tour following their