Under Armour gambled on Jordan Spieth when he was 19 after he met with a former NFL long-snapper

On Sunday, Jordan Spieth won his third major championship, further proving that the gamble Under Armour took on a little-known, 19-year-old golfer in 2013 was a brilliant one.

Among Under Armour's bevy of MVPs and tops-in-their-sport athletes, is Spieth, the face of their golf line. As was the case with many of the other athletes on Team Under Armour, they jumped on Spieth's bandwagon early, long before he was a household name.

One source told Business Insider that the person most responsible for helping Under Armour land not only Spieth, but several other members of their all-star lineup, was Ryan Kuehl, a former NFL player.

Kuehl, who is now Under Armour's vice president for sports marketing and sponsorships, spent 13 seasons in the league as a defensive lineman and long snapper and won a Super Bowl with the New York Giants in 2007.

explained in an interview with Business Insider what he saw in then-19-year-old Spieth in 2013 when the two first met. While Kuehl acknowledged Spieth's solid record as an amateur, it was more about how he handled himself off the course that told Kuehl this young golfer could be the face of Under Armour's new venture into the world of golf.

"It was more about the way he handled things, he was mature beyond his years" Kuehl told Business Insider. "Clearly the talent was there, his record proved that. But it was his mentality, how he looked at people, how he looked them in the eye, how he treated people, even as an amateur."

Kuehl went on to explain that, even at 19 years old, Spieth carried himself like somebody who could handle the responsibility of being the face of a sport and how his personality was the type that people gravitate towards.

"As an individual athlete in a [non-team] sport, you have to be comfortable being the man," Kuehl explained. "You have to be comfortable with everyone going after you and not everybody is comfortable with that. Based on his record and then you look at the way he handled things, how [other golfers] were still rooting for him, even at the top of the mountain as a junior, clearly there's a personality there. There is something that attracts people to him."

Maybe more importantly, Spieth just seemed like he already had a grasp at 19 of what it meant to be a professional, but at the same time, he knew his role and his place in the golf world.

"He looked like he belonged," Kuehl said. "He wasn't nervous at all. He would laugh and joke and talk with other Tour players. He looked fans in the eyes. He picked up flag sticks for his caddie. All those little things that showed he was pretty self-aware. It was a pretty powerful combination, where you've got talent, with a maturity with a strong sense of self-awareness and purpose."

Four years later, Spieth has done nothing to prove Kuehl wrong. Spieth is one of just two golfers ever to win three legs of golf's grand slam before turning 24, he has spent time as the No. 1 golfer in the world, and not only do fans love Spieth, so do his fellow golfers.

After his win at the Masters in 2015, other golfers gushed about the young champion.