MEXICO CITY - Ariya and Moriya Jutanugarn easily dispatched their US and Canadian opponents and will face each other Friday at the Lorena Ochoa Match Play tournament at the Club de Golf Mexico.
Elder sister Moriya defeated Canadian Alena Sharp 2 and 1 in their match, while "little sis" Ariya even more quickly defeated American Amy Anderson 5 and 4.
The tournament features 17 of the top 25 players in the world rankings including No.1 Lydia Ko of New Zealand and No.3 Ariya.
The 64-player field is divided into four groups of 16 players with 32 matches of single elimination concluding with the final on Sunday.
Ariya and sister Moriya are in the same Annika Sorenstam group. Only one will survive to play in the penultimate round on Saturday.
Ariya won five titles last year but has yet to claim one this season with two runner-up finishes.
She is coming off a joint ninth place at last week's Texas Shootout for her seven top 10s this season.