Mao Saigo fires 66 for US Women’s Open lead as she chases second major of year

• Saigo leads at 8 under after six birdies in strong round

• Korda shoots 67, tied second in best U.S. Open showing

• Kim, Shibuno among six chasing as play halts at sunset

Mao Saigo already won her first major title this year. She's putting herself in position for another at US Women's Open.

Saigo shot a 6-under 66 on Friday to take second-round lead at Erin Hills. At 8-under 136, the 23-year-old Japanese player had a three-stroke advantage over a group of six led by top-ranked Nelly Korda.