Betts possesses all five tools, and he could use them to become not just an American League All-Star this season, but perhaps an AL Most Valuable Player Award candidate.
After an impressive break-in to the Majors in 2014 and a strong first full season in '15, the coming campaign is the one in which Betts could become elite.
"He's one that strives to be great," said Red Sox manager John Farrell. "He's not satisfied with what he's done to date. He has an inquisitive personality. He's always wanting to get better. He's got tremendous aptitude from what we've seen. He might be one of our most dynamic offensive players on this club. His rise has been meteoric, but he's remained grounded and he's a great teammate."
Remarkably, Betts is just 23 years old.
"He's going to be a superstar, no question," said Red Sox designated hitter David Ortiz. "The guy is 23 and he's already a star -- and he hasn't even walked into his prime yet. He's working extremely hard -- and when you have that talent, that's all you need to be a superstar. He's got quick hands. He reminds me of Gary Sheffield."
The one person you won't hear wax poetic about Betts is, well, Betts. The outfielder constantly downplays his accomplishments and his potential. But teammate Jackie Bradley Jr. says that you shouldn't let that fool you.
"Mookie's one of the guys that will say one thing, but he's not necessarily thinking that," Bradley said. "He's all like, 'I'm not that good,' this and that. [I'm like], 'Shut up, Mookie. You're good.' It's one of those things where he's just saying it to downplay it, but that's just the way he is and the way he operates. He actually does have a lot of confidence. He might not show it, outwardly speaking, but he's a very confident guy."
Betts in 2015 became one of four players in history in his age-22 season to have 60-plus extra-base hits, 20-plus stolen bases and fewer than 90 strikeouts.
"Just a lot of hard work, studying some film, going over some things with [hitting coach] Chili [Davis], and just trusting it and putting it into action," Betts said. "I started to see some success, and that gave me more confidence."
To a man, the Red Sox have the utmost confidence that their leadoff man is on the cusp of greatness.
"I love Mookie," said Red Sox shortstop Xander Bogaerts. "I really enjoy watching Mookie play. Every time he hits, you can learn from [it]. Sometimes he gets a bit hard on himself, but that's what drives him to become what he is."
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.