Top-ranked Lydia Ko shot a course-record 11-under 61 on Saturday to take the early second-round lead in the New Zealand Women's Open.

The 17-year-old New Zealander, coming off a victory Sunday in the Women's Australian Open, broke the Clearwater record of 63 set last year by Mi Hyang Lee in her victory.

Ko rebounded from an opening bogey with an eagle on the par-5 second and birdied Nos. 4-7, 9-13 and 18. She had a 13-under 131 total.

England's Charley Hull was second at 10 under after a 64.

The tournament is sanctioned by the European and Australian tours.