BEDMINSTER, N.J. -- Sung Hyun Park won the U.S. Women's Open on Sunday for her first LPGA Tour victory.

The 23-year-old from South Korea shot her second straight 5-under 67 and won a day-long battle with front-running Shanshan Feng and teenage amateur Hye-Jin Choi at Trump National Golf Club.

Park, who birdied the 15th to move into a tie for the lead and the 17th to open a two-shot edge after Choi made a double bogey on the previous hole, finished at 11-under 277 for a two-stroke win over Choi.

President Donald Trump attended the biggest event in women's golf for the third straight day. For hours each of the tournament's last three days people who had bought tickets to the championship found themselves with front-row seats to President Donald Trump's glad-handing, chit-chatting, sports watching and french-fry eating.

Usually Trump had his back to the green and the oglers, watching the competition on a TV screen when not greeting a stream of guests and visitors that included golfers and club managers plus his son, daughter-in-law and national security adviser.

Every so often, Trump acknowledged the crowd outside the booth, waving to them, pointing at those wearing Trump campaign merchandise, and offering a thumbs-up or a first bump. That prompted squeals from a group of schoolgirls on Friday and tears from a woman on Saturday. At one point on Sunday, the president drew cheers when he mimicked swinging a golf club.

It wasn't all smiles under the sun. Trump's presence drew demonstrators outside the course's gates to protest the U.S. Golf Association's decision to hold the event at Trump National Golf Club Bedminster, located about 45 miles west of New York City.

It ended up being a quiet week of politics. The golf was excellent.

Park needed a fine chip from over the green on the par-5 18th hole to save par, and she got a thumps-up from Trump as she walked to sign her scorecard.

Choi was the story for most of the final round. The 17-year-old had a two-shot lead with nine holes to play and needed a birdie at 15 to regain a piece with Park.

The 139-yard, par-3 16th over water ended her hopes. Her tee shot landed in the water to the right of the hole. She ended with a double bogey and basically lost her chance of becoming the second amateur to win the Open.

She birdied the final hole.

Catherine Lacoste remains the only amateur to win the Open, doing it in 1967.