EMMA HAYES hailed a “good start” to her reign as United States manager following a thumping 4-0 win over South Korea on Saturday but conceded there was “lots of work to do.”

Doubles from Mallory Swanson and Tierna Davidson secured victory for former Chelsea boss Hayes in front of a sold-out crowd of 19,010 in Colorado.

Four-time Olympic champions, the US are building towards this summer’s Paris Games, which begin late next month.