Lydia Ko became youngest-ever winner in LPGA Tour history at Canadian Women 's Open . Ko , 15 , became LPGA tour 's fifth-ever amateur champion -- its first since 1969 . Ko also won U.S. Women 's Amateur in Ohio and New South Wales open at Australian LPGA this year . TL;DR The youngest player to win a major is Lydia Ko, who becomes the fifth American woman to claim victory on the PGA Tour.
Lydia Ko became youngest-ever winner in LPGA Tour history at Canadian Women 's Open . Ko , 15 , became LPGA tour 's fifth-ever amateur champion -- its first since 1969 . Ko also won U.S. Women 's Amateur in Ohio and New South Wales open at Australian LPGA this year . Ko plans to maintain amateur status for time being .