Tour rookie Numa traded two birdies against three bogeys to tie for 24th place.
Thai No 1 Pornanong Phatlum suffered a disastrous triple bogey on the eighth hole to end the day on 76 for a tie of 77th, four shots ahead of teenage amateur Moriya Jutanugarn who hit a 80 and lies 126th. Americans Cristie Kerr, Brittany Lincicome and LPGA rookie Lizette Salas each fired a three-under-par 69 to share the lead.