Reflecting on the youngster's performance, Davenport revealed that her nation has pinned their hopes on Keys coming good.
"Keys is a big rising star. A lot of us from the States have big, high hopes for her. She is our biggest hope in the last 10 or 15 years," she told BBC Sport.
"I think we saw two future top 20 players there but, unfortunately for Heather Watson, Keys is the better suited to grass."
Keys is currently placed 52 in the world standings.