Jutanugarn moved to 1-under yesterday to be in a share of 32nd, two shots ahead of Ko.
Steven Alker might have had visions of a big jump up the leaderboard after five holes of his second round at the Safeway Open in California today. The Kiwi golfer hit four birdies in his first five holes to jump to a tie of 11th.
But a pair of consecutive bogies blighted his round and he carded a 3-under 69. He still had seven birdies in all, including ones on the final two holes, which helped him to a share of 29th, 10 shots behind leader Scott Piercy on a rain-interrupted day. Piercy pitched in for eagle, added a pair of birdies and maintained a two-shot lead until it was too dark to continue.
A steady rain that fell on Silverado for most of the day halted the second round for 2 hours, 36 minutes and prevented it from finishing until the third morning.
Bill Haas had a 2-under 70 and finished 36 holes in 8-under 136.
Piercy, who opened with a course-record 62, was at 14-under par after 12 holes of his second round.
New Zealand No 1 Danny Lee has some work to do to make the cut, sitting on 1-under after 12 holes of his second round. He was in a share of 82nd with the projected cut at 2-under.