Morgan spent two months recovering from a knee injury in the build-up to the 2015 FIFA Women's World Cup. Morgan's knee injury happened in April during the NWSL season against the Boston Breakers. She made her first start at the World Cup Finals as the U.S. defeated Nigeria 1–0 in the last group match to advance as group winners. She registered her only goal of the World Cup's knockout stage with the opener in the 2–0 last 16 win over Colombia. Morgan did, however, win penalties for the USWNT in the 2–0 victories against Colombia in the last 16 and Germany in the semi-finals, respectively. She then started the 2015 FIFA Women's World Cup Final as the USWNT defeated Japan 5–2 to win its third FIFA Women's World Cup. Morgan played in all seven World Cup Finals matches and started in every one of them since being restored to the starting XI against Nigeria.