Tseng stroms into Oregon lead

Yani Tseng surged from five shots back to lead by three going into the final day of the Safeway Classic in Oregon.

Tseng carded a nine-under-par 63, mixing 11 birdies with two bogeys, to reach 18 under overall, three clear of halfway leader Pornanong Phatlum and world number three Suzann Pettersen.