The Swede stretched her arms jubilantly in the air when she realized that the ball had found the cup on the short par 3 hole.
However, all Swedes are far behind the leaders ahead of this weekend's golfing.
Ridderström is the best - two under par in total - and tentatively split 36th. One stroke behind are Anna Nordqvist, Pernilla Lindberg and Linnea Johansson