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The question when Xander Schauffele contended at the U.S. Open at Erin Hills last month was ... Wait, who is Xander Schauffele? You better get to know him now because Schauffele won the Greenbrier Classic on Sunday by one over Robert Streb with a final-round 67.

The rookie Schauffele started the day three back of leader Sebastian Munoz, and he continued a trend of no 54-hole leader of this tournament going on to win. The 23-year-old, who finished at 14 under on the week, is forever off the tee and finished No. 2 in the field in strokes gained with his driver and 15th in driving distance.

He won the tournament because he drove it well, but he put it away with a wedge.

The highlight of Schauffele's life-changing day came at the final hole where he hit a pitching wedge to four feet for birdie and the win. Schauffele would have to wait a few minutes to make sure Streb didn't birdie one of the final two holes, but he was clearly moved by the victory.

"Very shaky. Extremely nervous," Schauffele told CBS Sports' Dottie Pepper. "Typical first victory. I'm at a loss for words. It just changed my life, really. I need a little bit of time to take it all in."

Schauffele is a 2015-16 Web.com Tour graduate who first really burst onto the scene at the U.S. Open where he finished T5 and followed that up with a T14 at the Travelers Championship. Following this win, he jumps into the top 100 of the Official World Golf Rankings for the first time ever.

Schauffele was a stud as an amateur as he won the 2014 California State Amateur Championship over Beau Hossler. His father Stefan is a German-French immigrant who was a once-hopeful decathlete before his dreams were dashed in a car accident. Stefan tossed his dreams onto Xander and taught him how to swing a golf club, which his son does as beautifully as anyone on the PGA Tour.

Of course, there are a whole host of stud amateurs who never win professionally, and this win was far from inevitable. Schauffele played with Exhibit A on Sunday in Jamie Lovemark. The Californian was a can't miss kid who won the NCAA Championship as a freshman at USC. Then he moved on to the pros, got injured and still hasn't won.

But sometimes the dream story has an exclamation point at the end of a chapter in the middle of the book. Sometimes you follow a herculean U.S. Open performance with a pre-Open Championship win. Sometimes you earn your card for two more years just a few months removed from golf's minor leagues. Sometimes you stick a wedge on the last hole to make your own history. Sometimes what you always wanted to be comes to fruition. Sometimes. Grade: A+

Here are the rest of our grades from the Greenbrier Classic.

Phil Mickelson (T20): In his first event post-Jim "Bones" Mackay, Mickelson shot a 64 on Sunday with his brother Tim on the bag, which tied him for low round of the day. It's his 11th top 25 in 16 starts, but he still doesn't have a top-five finish. I don't know if that's incredible consistency or an inability to close the deal. Either way, he'll go into the Open with some momentum. Grade: B

Robert Streb (2nd): I'm writing about Streb's 65-69 weekend simply as an excuse to post this video of him hitting a drive with literally zero curve. Only Streb. Also, this week was a callback to a few years ago when he played the back nine on this course using a wedge as a putter and made a 30-foot putt. Grade: A+

Bryson DeChambeau (T14): The artist actually thrust himself in a tournament this weekend! He finished No. 19 in the field in putting, which is elite for him, and as a result he tossed together a few good scores. That's good to see because golf is always better when bigger and wilder personalities are involved. DeChambeau is both. This is his best non-opposite field event on the year. Grade: A-