Karrie Webb's challenge for the United States Women's Open faltered on day two at Lancaster Country Club as South Korea's Amy Yang, a young woman with a strong Australian connection, dominated the event.
Webb, who began the day with a share of the lead at four-under par, struggled to a second-round 72 to finish at two-under overall. The veteran Australian, who had gone bogey-free in the first round, had four blemishes on her card today with just two birdies.
Meanwhile Yang, who did her secondary schooling on the Gold Coast, made four consecutive birdies on the back nine for a 66 to lead by three shots from American Stacy Lewis.
Webb is tied for fifth, along with world No. 1 Inbee Park, five shots from the lead.
Perth's Minjee Lee (five-over) was the only other Australian to make the cut, carding a 72 in the second round to go with her opening 73.
The teenager is 12 shots from the lead through 36 holes.
Yang, 25, has won twice on the LPGA Tour but never in a major. In fact, she has never led a major through 36 holes. The Korean made world headlines in 2006 when as a schoolgirl, she qualified for the Australian Ladies Masters at Royal Pines and won the tournament, the youngest-ever winner of a Ladies European Tour or Australian Ladies Professional Golf tour event at just 16.
Yang was runner-up to Lydia Ko in this year's ISPS Handa Women's Australian Open at Royal Melbourne.
Now based in America, she is ranked 15th in the world.