PORTLAND • Stacy Lewis picked the right time to break out of a slump and the end of her winless drought will bring a windfall to the flood victims in her home town of Houston.

The American golfer had promised earlier in the week to donate her prize money to the Hurricane Harvey relief effort.

Lewis earned her first LPGA Tour title in three years on Sunday at the Portland Classic, firing a final-round 69 to defeat South Korean Chun In Gee by one stroke.

Lewis did it by playing steady golf down the stretch. She posted four birdies, two pars and a bogey over her first seven holes but then parred the final 11 holes to finish with a total of 20-under 268.

"That's unbelievable," said Lewis, of her US$195,000 (S$264,600) winner's cheque.

"When I said that I had the goal of winning the tournament, you have got to get a lot of things right.

"We're going to be able to help rebuild houses. That's more important than anything."

Hurricane Harvey has killed at least 50 people and unleashed massive flooding that damaged up to 50,000 homes in Houston.

For Chun it marked another runner-up finish this year. She shot a six-under 66 while Thailand's Moriya Jutanugarn (72) and American Brittany Altomare (69) finished in a tie for third, six shots adrift of the lead.

"I made another bogey-free round. I think it was a great round today," Chun said.

AGENCE FRANCE-PRESSE