Presidents Cup 2015: Final Results Standings, Top Scorers and Leaderboard

The 2015 Presidents Cup was just the third ever to be decided by one point or less, but the United States improved to 9-1-1 overall with a 15.5-14.5 triumph over the International team.

A captivating conclusion unfolded during singles matches at Jack Nicklaus Golf Club Korea in Incheon, South Korea. The International side staged rallies and upsets in multiple matches, with the most notable being Marc Leishman defeating Jordan Spieth 1 up.

It came down to the last hole, resulting in Bill Haas—son of U.S. captain Jay Haas and an at-large selection—winning 2 up over Sang-Moon Bae. The latter was playing in his home country and had the chance to salvage a draw, but he flubbed a chip on the par-five 18th to erase that possibility.

Check out the results from Sunday's singles matches, which wound up dead even at six apiece:

USA	Score	Internationals
Patrick Reed	Halved	Louis Oosthuizen
Rickie Fowler	6 and 5	Adam Scott*
Dustin Johnson*	2 and 1	Danny Lee
J.B. Holmes	1 Up	Hideki Matsuyama*
Bubba Watson	Halved	Thongchai Jaidee
Jimmy Walker	2 Up	Steven Bowditch*
Phil Mickelson	5 and 4	Charl Schwartzel
Chris Kirk	1 Up	Anirban Lahiri
Jordan Spieth	1 Up	Marc Leishman*
Zach Johnson	3 and 2	Jason Day
Matt Kuchar	2 and 1	Branden Grace*
Bill Haas	2 Up	Sang-Moon Bae

Jay Haas couldn't hide his emotion when his son clinched the Cup:

The reason Bae was in position to halve with Bill Haas and tie for the Cup was thanks to the point Branden Grace had notched in the penultimate match after defeating Matt Kuchar 2 and 1. Grace's win brought his record to 5-0 for the week, as he was the clear MVP for the International team.

"My last Presidents Cup I was 0-4. That's a pretty big step in the right direction," said Grace afterward, per the PGA Tour's official Twitter account.

Grace was in contention at this year's U.S. Open and placed third at the PGA Championship as well. At age 27, he's already won six times on the European Tour, so he's really establishing himself as a legitimate star.

Golf Channel's Justin Ray highlighted the significance of Grace's achievement:

The other International player to go undefeated at the 2015 Presidents Cup was Louis Oosthuizen. His record was a stellar 4-0-1, with his only halve coming in singles against Patrick Reed in Sunday's opening match.

Reigning Open Championship winner Zach Johnson posted a 3-0-1 record to co-lead the Americans along with captain's pick Phil Mickelson. For those who lamented Jay Haas' choices of his son as nepotism and Mickelson as a lack of merit based on his recent form, the pair came through in fine fashion this week.

Fox Sports' Shane Bacon analyzed the mystique Mickelson brought to the competition as the most seasoned Presidents Cup veteran, compensating for the absence of other exciting players like, say, Brooks Koepka:

Mickelson saved some of his best for the end, thrashing Charl Schwartzel 5 and 4 in singles to make it 12-10.

The big turning point came when the USA's Chris Kirk made a lengthy birdie putt at the par-five last against Anirban Lahiri, who missed from about four feet away to give the U.S. a big point at 13.5-12.5.

One of the surprises of the week was Jason Day. After going on a tear to win the PGA Championship and three other marquee events toward the end of the season and in the FedEx Cup playoffs, Day couldn't find his stride in South Korea, posting a dismal 0-4-1 record.

Had Day been performing at his best, there's reason to believe the International side would be hoisting the Presidents Cup. It puts a bit of a damper on an otherwise phenomenal year for Day, who was looked at as the leader of the International team this time around but didn't lead by example with his performance.

Nevertheless, the close outcome has to give the Internationals confidence moving forward in this biennial competition. Day will be especially fired up to get back in 2017 and give his side the extra kick it needs to get over the hump for a second Presidents Cup triumph.

The next Presidents Cup is to be held stateside at Liberty National in Jersey City. It hosted The Barclays in 2009 and 2013 and is most unique since it offers a view of the New York City skyline from the course.

JUNG YEON-JE/Getty Images

Mickelson is a member at Liberty National and could well return for a 12th Presidents Cup thanks to his leadership and experience, factors that made a big difference this week.

This may be something only yours truly thinks about, but with how much Mickelson has struggled on the PGA Tour in recent years, perhaps this Presidents Cup will spark him.

Adam Scott, who defeated Rickie Fowler 6 and 5 in Sunday singles, had risen to world No. 3 before taking a nosedive in 2009. After he was rewarded with a captain's pick for that year's Presidents Cup by his idol Greg Norman, Scott rediscovered his game.

Something similar may be in store for Mickelson, who will have two more cracks at the career Grand Slam in the U.S. Open before the Presidents Cup comes around again.