Kammala jumla mai zuwa: Ertz ya buga wasan ƙwallon ƙafa tare da Santa Clara University Broncos daga 2010 zuwa 2013. Bayan aikinta na kwaleji, Chicago Red Stars ta zaɓi Ertz a matsayin na uku a cikin 2014 NWSL College Draft wanda ya faru a ranar 17 ga Janairu, 2014. Ertz ya taimaka wa Amurka ta lashe taken su a gasar cin kofin duniya ta mata ta 2015 da 2019. A 23, ita ce ta biyu mafi ƙanƙanta memba na 2015 tawagar bayan 22-shekara Morgan Brian. Amurka ta ci gaba da zuwa
Wasannin karshe na gasar cin kofin duniya inda ta buga kowane minti na dukkan wasanni bakwai na gasar kuma daga baya aka sanya ta a cikin FIFA Women's World Cup All-Star Team.