Five storylines from the final round of the U.S. Women’s Open

We'll be keeping an eye on the U.S. Women's Open over the next four days, so in an effort to keep you up-to-date with everything that's going on at Blackwolf Run, we're going to provide you with the top five storylines from each round. Here's a look at Day 4.

Na Yeon Choi wins U.S. Women's Open by four shots — For a couple minutes on Sunday afternoon, it looked like Na Yeon Choi was on the verge of producing one of the worst collapses in major championship history. Holding as five-shot lead as she made the turn, Choi pulling her tee shot into the trees on the par-5 10th and walked off the green with a triple-bogey 8, cutting her lead to two shots over Amy Yang. Then came the approach on the 12th that landed in the high grass, leaving Choi with a nearly impossible up-and-down from above the green. Despite the suggestion from her caddie to take a drop, she decided to hit the shot anyway, hacking it out and then canning a 20-plus footer that kept the lead at four with six holes to play. Choi didn't make things easier on herself down the stretch, but she did leave Blackwolf Run with a new piece of hardware to become the fourth South Korean in the last five years to win the U.S. Women's Open.

Amy Yang a future major champion? It's possible — Trying to peg a future major champion is an inexact science, but the way Amy Yang's been playing on golf's biggest stage, you have to believe it's only a matter of time before she becomes the next South Korean to win a major. Yang, who finished second to countrywoman Na Yeon Choi, now has four top-10 finishes in her last five majors (three of her last four have also been top-5 finishes). With the Women's British Open coming up, it wouldn't be a complete shock to see her win at Royal Liverpool.

Se Ri Pak posts top-10 finish at the site of her U.S. Women's Open win — There was no dramatic 20-hole playoff victory this time around, but Se Ri Pak should be proud of the way she played this week at Blackwolf Run. The 34-year-old South Korean returned to the site of her 1998 U.S. Women's Open win over 20-year-old Jenny Chuasiriporn and posted a T-9 finish, her second top-10 at a major this year. Pak hasn't won a tournament since the 2010 Bell Micro LPGA Classic, but it was great to see her have a strong week at a place that means so much to her.

Michelle Wie struggles again — After recording seven birdies on Friday, Michelle Wie weekend struggles continued on Sunday with an 8-over 80 that included six bogeys and a triple. Looking at Wie's stats it's obvious a couple areas of her game still need work. Despite hitting 70 percent of her fairways for the week, Wie struggled to hit only 63 percent of her greens in regulation and averaged 1.72 putts per hole (and that's with a 23-putt performance on Friday). If you have any weaknesses in your game, they're usually exposed at a major championship. There's no question Wie's were exposed -- especially over the last two days.

Day 4 notes — Choi became the sixth South Korean in the last 15 majors to capture a major championship. ... Sandra Gal produced her highest major championship finish to date with a third-place showing. ... Paula Creamer's T-7 at the U.S. Women's Open was her third top-10 finish in the last six major starts. ... A day after four players posted red figures, 12 players came in under par on Sunday.