At 19 years , one month and 27 days , Thompson becomes the second youngest winner of a women 's major after compatriot Morgan Pressel ( 18 years , 10 months and nine days ) won the same tournament back in 2007 . 19-year-old becomes second youngest winner of women 's major title . Lexi fires three 68 to in final round to beat Michelle Wie by four-under strokes . Thompson became youngest Se Ri Pak winner in today .
19-year-old becomes second youngest winner of women 's major title . Lexi fires three 68 to in final round to beat Michelle Wie by four-under strokes . Thompson became youngest Se Ri Pak winner in today .