PRATTVILLE, Ala. (AP) -- Lexi Thompson made a little more history Thursday in the Navistar LPGA Classic, opening her title defense with a career-best 9-under 63 to match the course record.
Last year, Thompson became the youngest champion in LPGA Tour history at age 16, winning by five strokes. Fifteen-year-old amateur Lydia Ko broke the record last month in the Canadian Women's Open.
Thompson had nine birdies in her bogey-free round on the links-style Senator course at the Robert Trent Jones Golf Trail's Capitol Hill complex. She missed only one green in regulation and had 26 putts.
"It feels really good getting a first round of 63 under my belt, but you just have to take it one shot at a time," Thompson said. "I hope to play like I did for the next three rounds."
Mika Miyazato and Lindsey Wright shot 63 in the 2010 event.
Lizette Salas and Hee Young Park were tied for second at 65, and second-ranked Stacy Lewis was another stroke back along with Karen Stupples, Amanda Blumenherst, Wendy Ward and Mi Hyang Lee.
Top-ranked Yani Tseng and Michelle Wie were eight strokes behind at 71.