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.

“I think you can see we’re building something,” Hayes was quoted as saying by ESPN.

“There’s lots of work to do. There’s lots of holes in our play, no question, but it was a good start. Everybody did what I asked of them.

“I felt for the first 30 minutes, it was technical execution where we struggled. We scored in our first three chances, so we were efficient, we were clinical.”

The US will prepare to face South Korea again tomorrow in St Paul, Minnesota.