PHOENIX — Stacy Lewis won the LPGA Founders Cup on Sunday to jump to No. 1 in the world, taking advantage of Ai Miyazato's collapse on the 16th hole.
A day after Lewis was penalized two strokes for her caddie's error on the short par-4, the American took a two-stroke lead with a birdie on the hole after Miyazato's double bogey following an errant approach shot that left her with an unplayable lie in a desert bush.
Coming off a win two weeks ago in Singapore, Lewis won for the seventh time on the LPGA tour to end Yani Tseng's 109-week run at No. 1.
"It's crazy," said Lewis, who was forced to wear a back brace for 18 hours a day for six years as a teen because of scoliosis. "That was my goal kind of since the middle of last year, and I really didn't think it would be possible this quick. … I'm going to have fun, I know that. I watched Yani struggle with it for too long, and I'm going to go have fun."
Lewis, 28, the tour player of the year in 2012, closed with 8-under 64 at Desert Ridge to finish with a tournament-record 23-under 265.
Miyazato (71) was second, three strokes back. The Japanese star led Lewis and Jee Young Lee by four after Lewis was penalized Saturday. The tour ruled caddie Travis Wilson tested the sand before Lewis played out of a bunker on No. 16.
"I wasn't even mad at him because he didn't do anything on purpose," Lewis said. "I just felt really bad for him just because all the stories were 'Stacy Lewis' caddie, Stacy Lewis' caddie.' The spotlight was on him, and he never wants that."
Tampa's Cindy LaCrosse (74) finished at 285, tied for 61st.
Champions: David Frost won the Toshiba Classic, shooting 65 in Newport Beach, Calif., to defeat Fred Couples by five strokes and tie the tournament record of 19-under 194 set by Jay Haas in 2007.