COLORADO SPRINGS, Colo. -- The 2011 U.S. Women's Open took an extra day and three more holes, but officially concluded on Monday with Duke junior Lindy Duncan placing as the top collegiate golfer in the field.

"It was awesome just to be there at the U.S. Open," commented Duncan. "The last two rounds I got to play with Natalie Gulbis and Maria Hjorth, who are both really good LPGA players. So I got to see some good pros play. I played one of my practice rounds with I.K. Kim, who was up on the leaderboard most of the time. I really just soaked it up and tried to learn as much as I could from the experience."

A native of Fort Lauderdale, Fla., Duncan turned in rounds of 70, 78, 76 and 76 for a total of 300 and is placed tied for 59th overall at 16-over-par. She was competing in her third professional tournament and made the cut for the first time. Duncan had participated in the 2009 U.S. Open and 2008 Ginn Open.

Following her first round one-under-par, 70, Duncan was tied for fifth overall. This put her on the first page of the leaderboard and led her to making her first professional cut.

"It was really cool after the first day to see my name on the leaderboard," said Duncan. "The whole thing was so cool. The weather was crazy and right now it is hard to digest it all. It was really fun."

Duke University two-time All-America in 2004 and 2005, Brittany Lang placed tied 50th with rounds of 72, 74, 81 and 71 for a total of 298, which was 14-over-par.

So Yeon Ryu birdied her final hole to send the U.S. Open into a three-hole playoff along with Hee Kyung Sea, who both finished with a three-under-par, 281, which was three-under-par. Ryu went on to register two birdies in the three extra holes and won her first U.S. Open. Moriya Jutanugarn took the lowest amateur medal with a four-day total of 294, which ranked tied for 32nd.