ROCHESTER, N.Y. — Jiyai Shin dedicates each one of her golf victories — make that five in 11 months — to her mother.

The 21-year-old South Korean star, whose mother was killed in a car crash in 2004, shot a 1-under 71 yesterday to win the Wegmans LPGA by seven strokes with a 17-under 271. It was the biggest margin of victory at the tricky, tree-lined Locust Hill course since Patty Sheehan beat Nancy Lopez by nine strokes in 1992.

"I have my mother's picture in my course book," Shin said proudly after picking up a $300,000 prize that vaulted her to the top of the money list above Cristie Kerr, In-Kyung Kim and Lorena Ochoa with $1 million.

Kristy McPherson and Yani Tseng each shot a 66, the day's best score, to surge into a second-place tie at 10 under.

Honolulu's Michelle Wie closed with a 69 to finish in a tie for 10th at 7-under 281. Kapalua touring pro Morgan Pressel, who started the round four shots behind Shin in second place, stumbled to a 78 and finished in a tie for 15th at 282.

Shin lengthened her lead over Wie in the rookie of the year standings to 405 points. She also jumped from fourth to first in the Rolex Player of the Year rankings with 90 points, nine ahead of Kerr.

"I have a lot of tournaments" left to play this year and "maybe I try more wins," Shin said. "Still, my goal is rookie of the year."

Shin carried a four-stroke lead into the final round in the Rochester suburb of Pittsford. She never looked in danger of being caught, even when she picked up two straight bogeys near the close as a downpour produced a flurry of errors.

The $2 million tournament drew 18 of the season's top 20 money winners. Ochoa, the world's top-ranked player, and Suzann Pettersen, the runner-up here last June, were among the absentees.

A multiple winner on the Korean tour, Shin became the first non-LPGA member to win three events when she reeled in the Women's British Open last August. She followed with late-season wins in the Mizuno Classic and ADT Championship and, in March, captured the HSBC Women's Champions in Singapore for her first victory as a tour member.

Shin rolled in an 8-foot birdie putt on No. 1, saved par from 20 feet on No. 6 but picked up her first of three bogeys on the next hole when her 7-foot putt curled left at the cup. She made amends from the same distance for a birdie on the par-5 No. 8 and her lead swelled to six when she birdied No. 10 from 12 feet.

Shin faltered with bogeys on No. 13 — where Pressel's prospects vanished with a triple bogey — and on No. 14, where she missed a 4-foot putt. But she birdied from 9 feet on No. 17.

Wie had six birdies without a bogey in the first 11 holes, including three in a row at Nos. 9 to 11. But she gave four shots back on the next three holes with a double-bogey on No. 13 sandwiched between bogeys on Nos. 12 and 14, all par-4s. After consecutive birdies on the par-4 No. 16 and par-5 No. 17 to get back to 4 under, she bogeyed the par-4 18th.

Wie, a Punahou School alum and Stanford sophomore, earned $35,629 to push her 2009 earnings to $361,960 in 10 LPGA tournaments.

Wie is entered to play in this week's Jamie Farr Owens Corning Classic at Sylvania, Ohio. She would have to win the tournament to qualify for next week's U.S. Women's Open after she missed making the field in a sectional qualifier on June 15.