Lloyd put the Americans ahead with a header in the ninth minute and Morgan added to the lead with a low shot from inside the area less than a minute into the second half at the Mineirao Stadium in Belo Horizonte.
Carli Lloyd, Alex Morgan power U.S. women past New Zealand in Olympics opener →
"I think it's going to come, and we're building," Morgan said. "We used those group stage games as building blocks, and we're just going to keep getting better."
United States readies for upstart Colombia in opening match of knockout stage →