Lydia Ko has become the youngest player to win the LPGA Tour's rookie of the year award.

The 17-year-old Ko clinched the points-based award with three tournaments remaining on the LPGA Tour schedule. She already has two victories, two runner-up finishes and nine other finishes in the top 10.

Laura Baugh was 18 when she won the LPGA Tour rookie of the year in 1973.

Ko is No. 3 in the women's world ranking and is No. 4 on the LPGA Tour money list with just over $1.5 million going into the Lorena Ochoa Invitational this week in Mexico. She also is third in the Race to the CME Globe, a season race that culminates next week in Florida with $1 million going to the winner.