Sophia Smith believes the United States have "so much potential" after her extra-time winner sent them through to their first Olympics final since 2012.

The 23-year-old's 95th-minute strike proved the decisive goal of the USWNT’s 1-0 semi-final victory against an injury-stricken Germany.

The result means new coach Emma Hayes will have the chance to go for gold in her first major tournament at the helm.

Smith dedicated her goal to the effort of the whole US squad under the ex-Chelsea boss.

"I just saw an open net in front of me and knew I had to step up in the big moment," Smith told NBC. "I felt I had to do that for this team, we've been working so hard.”