In-Kyung Kim is one shot back at 7 under, followed by Lindy Duncan at 6 under.
Steen is tied with three others in fourth, including Lexi Thompson.
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West Chester native Marissa Steen fired a 5-under-par 67 on Thursday in the first round of the Ricoh Women’s British Open at Kingsbarns Golf Links in St. Andrews, Scotland.
Steen, a 2008 Lakota West graduate, is tied for fourth entering Friday’s second round. She’s three shots back of leader Michelle Wie, who shot 64.