Karl-Anthony Towns was known for being confident, but this time he was bordering on bold.

Although just a college freshman, Towns had already held his own against NBA superstars like LeBron James and Kevin Durant, and then-No. 1 overall pick Anthony Davis, in an exhibition game against Team USA at age 16. So while on the bus in The Bahamas for an international preseason series in 2014, including a game against Towns' Dominican Republic, the 18-year-old burgeoning star let it be known to his new teammates and coaches that he was ready for more.

At least that's how Kentucky assistant Kenny Payne remembers it.

"I can't wait to be on the team that plays against the Olympic team," Payne recalled Towns saying. "I'm gonna put it on KP's guys."

Payne immediately pulled out his phone and called the number he has listed under "My baby giraffe."

Davis, a 2012 Olympic gold medalist fresh off his first All-Star season in the NBA, was on the other line.

"I forgot what was said, but I remember him calling me because Karl was talkin' some crap while he was still at Kentucky," Davis said with a big smile. "[Payne] will do that. He'll put you on the spot."

The calls kept coming, this time with Davis doing the dialing.

"I went from a 'nanny goat' to 'baby giraffe.' And every now and then when I play well on both ends of the floor, an all-around game and we get the win, he'll call me a pit bull. Most of the time it's 'baby giraffe.'" Pelicans star Anthony Davis

"For over two months, even during the season, Anthony would call me at least three times a week [and say], 'I can't wait to play against Karl. I'm going to demolish him,'" Payne said.

Last December, in his first NBA game against Towns, Davis finished with 35 points, 7 rebounds and 2 blocks in a 114-99 victory. Towns, however, held his own, with 20 points and 13 rebounds.

In their second and only other meeting, Towns had 19 points and 12 rebounds but Davis put up 27 and 8 in another Pelicans win.

"It was fun to see them play against each other and to see Karl battle, to see Karl earn Anthony's respect as a player," Payne said. "They respect each other. And for me, that's the greatest thing in the world to see because it's not fake. It's real. It's not talked about. You can see it when they play each other on the court."

That doesn't mean he stopped needling his two former protégés. Payne, a top assistant for Kentucky head coach John Calipari since 2010, has become well-known among Wildcats alumni for "gassing up" their NBA matchups.

Towns said he couldn't remember specifically what he said in The Bahamas to spark the call to Davis, but he knows the broad strokes well.

"You can say one simple word, and he takes it to a whole other level," Towns said.

"I'm an agitator," Payne said with a laugh.

The head-to-head competitions of their former players has become a point of pride for the Kentucky coaching staff, even as they become increasingly tougher to track as Wildcats multiply on NBA rosters like honeybees. They're of particular significance to Payne, who says his goal in his short time with the nation's elite teenagers is to build a foundation for their professional careers and for the adversity that inevitably comes with them.

"Sometimes I think when you're so gifted as a high school player, you expect it to be easy," he said. "And then the true test is when you find out it's not easy. That you've got to go through hard times. That you fight through it. And that's what's going to make you great."

Anthony Davis vs. Karl-Anthony Towns: the NBA's next great rivalry? David Sherman/NBAE via Getty Images

Davis' battle is one Payne calls "one of the most unique in all of sports." Payne says Davis, a high school guard who famously shot up seven inches between his junior and senior year at Perspectives Charter School in Chicago, was so self-conscious about his body when he got to Kentucky that he asked the strength coach if he could lift weights by himself.

"He could only lift the bar and 10 pounds on each side," Payne said.

That, combined with a relentless approach, earned him a set of nicknames from Payne, ones that, even now, the 23-year-old forward who checks in at a muscular 253 pounds can't escape.

"I used to call him 'Madagascar,' because his mentality is, in [the film] 'Madagascar,' there was a baby giraffe or giraffe that thought it was a pit bull or a lion or a tiger," Payne said. "And that's how he is, that's how he's wired. He didn't care that he was 190 pounds. Did not care. He felt like he was 220, 240. And he played that way. His mentality was not, 'I'm fragile, I'm thin.' His mentality, even though he was thin, was 'I'm a pit bull.'"

Said Davis: "I went from a 'nanny goat' to 'baby giraffe.' And every now and then when I play well on both ends of the floor, an all-around game and we get the win, he'll call me a pit bull. Most of the time it's 'baby giraffe.'"

To bring it out of him, Payne, whom both Davis and Towns affectionately refer to as "Uncle Kenny," turned to another branch of the animal org chart.

"We have a philosophy here: We play like a guard, and we finish like a bee," he said.

For Davis, who often brought the ball up the court and fired away from the perimeter in high school, that meant a crash course in playing the post, one that began with a harsh lesson. Payne says he warned Davis before the season that if he didn't work his post moves, Calipari was going to stop practice after one of his "weak moves" and tell the rest of the team that they're not allowed to toss it to him with his back to the basket, that he could be a finisher only on lobs and on the boards.

"He looked at me, he laughed," Payne said. "'C'mon, Uncle Kenny. I got this.'

"OK," Payne said he told him.

"First day of practice, I think Doron [Lamb] threw him the ball in the post, he went to crab-dribble middle, somebody bumped him and then he fell down and threw the ball up and missed the shot.

"He looked at me, and I could see it in his eyes, like, 'OK. I got it. I surrender.' And from that day on, and even to this day, I can't be more proud of any player that's been in this program -- that's been in my life -- than that kid."

Kentucky assistant Kenny Payne enters his seventh season under Wildcats head coach John Calipari. Jamie Rhodes-USA TODAY Sports

Towns entered college with a body better built for staycations on the blocks, but Payne said the young big man's advanced outside shooting made him even more reluctant to embrace a life spent pounding away in the post.

"All he did was shoot 3s in high school," Payne said. "I never saw him do a post move. And so when he got to Kentucky, we, again, similar to Anthony, we got to give you a foundation. We know you have an unbelievable touch. But let's take that unbelievable touch and dominate this paint."

But Towns, a straight-A student, said his inquisitive nature would sometimes lead to questions about the plan.

"One of the first things I had to learn was, the kid is highly intelligent and he loves to debate and loves to analyze and talk through," Payne said. "So I had to tell him, 'Look, Karl. You're smarter than me. I get it. You're smarter than me. But if you ever question what we're doing with you to help you get better, we'll just go to the treadmill and run your questions out.'

"From that day on, he never questioned anything. He came in and was like a sponge."

The light-bulb moment wasn't immediate. While never discouraged, Towns struggled, according to Payne. But when things clicked for the eventual first overall draft pick around midseason, the Kentucky team was again gathered for an important lesson centered on its all-world big man.

"Here's an example of a kid that struggled," Payne recalled telling them of Towns. "Whose confidence could have been rocked. Whose self-doubt could have creeped in, and most of this is confidence. But his never wavered. [Had] any of you went through what he went through, would your confidence have wavered? Because we all think we're invincible as players. And when we get rocked, it knocks us for a loop and it changes who we are and our demeanor and how we look at ourselves.

"And this kid, it never wavered."

In 2012, Davis' U.S. team battled Towns' Dominican Republic squad in Las Vegas. David Becker/Getty Images

With his first game of the season against Towns on Wednesday (9:30 p.m. ET, ESPN), Davis said he expected to hear from Payne soon. Payne, however, says his role in the friendly rivalry is now on autopilot.

"I don't have to gas it up anymore," he said. "They'll let me know."

But their dialogue is ongoing. Davis says he talks to Payne twice a week just to check in on each other's lives. When former Kentucky teammate and Charlotte Hornets forward Michael Kidd-Gilchrist suffered a torn labrum in his right shoulder last year, Davis' first call was to Payne.

"As soon as it happened, Anthony called me and was in tears," Payne recalled. "Like, 'Is he all right? Is he in the hospital?'"

Davis played a similar role for Payne years before.

"I lost my mother right before the [2012] season," Payne said. "If it wasn't for Terrence Jones, Anthony Davis and Michael Gilchrist, I don't know how I would have made it through that year. I love him. At the lowest point of my life was also professionally the greatest point because I got to hands-on be a part of Anthony's life and a major foundation into what he is today."

Said Davis: "He meant a lot to me, especially on the floor and off the floor. When his mom passed, it was a tough situation for anybody. I just tried to be there for him as much as possible -- the whole team was. There's no guy who went to Kentucky while he was there who doesn't respect him."

Towns agrees.

"He's my uncle," Towns said. "He's family. I'm real close to him, and I'd do anything for him."

While he may not be as vocal these days, Payne is just an instigating phone call away.

"They know I'll be watching."