Tseng Ya-ni moved into position to end a long victory drought, shooting a 9-under 63 on Saturday to take a three-stroke lead into the final round of the LPGA’s Safeway Classic in Portland, Oregon. Tseng, the 24-year-old from Chinese Taipei who has 15 LPGA Tour titles and had a 109-week run at No. 1 in the world ranking, is winless in 36 events since the Kia Classic in March 2012. She has tumbled to No. 15 in the world and missed cuts in four of her last five tournaments. Norway’s Suzann Pettersen, the 2011 tournament winner, was tied for second with Thailand’s Pornanong Phatlum. Pettersen had a 70, and Pornanong, the leader after each of the first two rounds at Columbia Edgewater, shot an even-par 71.