The school girl beat second-place qualifier Kathleen Scavo by seven strokes to earn her way into the field for the June 19-22 championship at Pinehurst in North Carolina.
Lexi Thompson, at 12 years, four months in 2007, previously held the mark as youngest to qualify.
Li will not be the youngest player ever to participate in the U.S. Women's Open as Beverly Klass was 10 when she competed in the 1967 championship, prior to the qualification process.
The young Californian has already tasted the limelight, having won her age group at Augusta National's inaugural Drive, Chip and Putt Championship last month ahead of the Masters.
Last year, Li qualified for the match-play portion of the U.S. Women's Amateur Public Links Championship but lost in the first round.
Share
