Despite a spirited rally from an early 3-down deficit, Rachel Rohanna of Waynesburg, Pa., became the first of the three tri-medalists to be eliminated. Marina Alex of Wayne, N.J., registered a winning par at the par-4 19th hole to advance into a third-round match Thursday afternoon against 2007 U.S. Girls' Junior champion Kristen Park. Alex, who qualified for the 2009 U.S. Women's Open, was an All-American performer this past season at Vanderbilt University, where she will be a junior. By reaching the round of 16, Alex has matched her best performance in a USGA amateur championship. She also advanced to the third round at the 2008 U.S. Girls' Junior at Hartford Golf Club in West Hartford, Conn.