Jordan Spieth at US Open 2015: Leaderboard Score, Twitter Reaction from Sunday

The present and future of golf belong to Jordan Spieth. The 21-year-old captured his second major of the year, winning the 2015 U.S. Open.

At five under for the tournament, he finished one shot ahead of Dustin Johnson and Louis Oosthuizen. You can view the final leaderboard below:

According to Bleacher Report, Spieth is the youngest golfer to win two majors since 1922.

The other golfers to have won the Masters and U.S. Open in the same year don't make for a bad list, either, per ESPN.com's Jason Sobel:

Spieth's triumph all came down to Johnson's final putt on 18.

A double-bogey from Spieth on 17 opened up a three-way tie at four under between he, Johnson and Oosthuizen. Oosthuizen entered the clubhouse first, so he had to hope that neither Spieth nor Johnson birdied 18.

Spieth did exactly that, moving to five under and grabbing a one-shot lead. The MMQB's Peter King was surprised at how composed Spieth remained on No. 18 despite throwing two strokes away on the previous hole. Something like that could have a significant mental impact on other golfers:

Johnson still had the final say on the outcome. His second shot on 18 landed roughly 13 feet from the hole, which at the very least left him in a great position to birdie the hole. CBS Sports joked the end to the final round might end up aging Spieth a bit as he awaited Johnson's shot:

Sergio Garcia was glued to the action in the clubhouse:

Johnson's eagle putt missed left and coasted past the hole. He still had a very makeable birdie putt but watched as the ball slipped just off the lip. That handed Spieth the title in rather anticlimactic fashion.

"I'm in shock. I feel bad for Dustin", Spieth would say after the match, per Jason Sobel of ESPN.com. 

But Spieth will take the win all the same. And it's not like he simply got lucky on the final day and backed into a U.S. Open title. He was constantly in the thick of things near the top of the leaderboard from the first round on.

Spieth was also one of four golfers with a share of the lead after 54 holes. He, Johnson, Branden Grace and Jason Day were all tied at four under.

After the third round, he talked about how his experience winning the Masters helped to settle his nerves as he looked to finish out the U.S. Open on top, per Bill Nichols of the Dallas Morning News:

"

I think I'll be a little less anxious. I feel a little more relaxed right now after finishing the round versus when I finished Saturday at Augusta. I was amped and ready to start the next round. Right now, I'll be a little more patient, I think, in not letting my mind wander and being more focused on the next part of the routine to get ready for the round.

"

Spieth looked less like a young star in his early 20s and more a battle-tested veteran Sunday. He simply put his head down and plugged away while those around him slipped up.

Things didn't look promising early on for Spieth as he needed five shots to wrap up the par-four first hole. However, he quickly righted the ship, picking up pars on the next six holes and birdieing No. 8.

He maintained that pace on the back nine to ensure he remained atop the leaderboard.

In the end, the difference between Spieth and the rest of the field was his metronomic performance. He earned par after par after par while Johnson, Grace and Day all fell away at various points. USA Today's Christine Brennan put it perfectly:

Oosthuizen's late push added a little more intrigue, but this was ultimately Spieth's tournament to lose. He nearly threw it away with that double-bogey, but give him credit for quickly rebounding and birdieing 18.

In time, Spieth's U.S. Open title won't be remembered as a herculean feat of excellence. Sure, he did well to navigate an extremely difficult course, but this wasn't the kind of major victory that will go down in the annals of golf history.

If anything, Johnson's missed birdie putt on 18 will be the lasting image from Chambers Bay.

This tournament might take on an added significance should Spieth capture the Grand Slam, but that's still a ways in the offing.