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On June 29th 2014, the Red Sox announced that they would be calling up 21-year-old Mookie Betts, whom they had taken three years earlier with their fifth-round pick in the 2011 draft. As excited as I was see Betts attempt to live up to expectations—at the time, he’d been hitting .346/.431/.529 in a season split between Double- and Triple-A—I was even more excited to make bad Mookie Blaylock jokes on Twitter. Truthfully, I just didn’t expect the Betts hype train to ever arrive at its final destination.

Two years and a handful of weeks later, the joke is on me. Betts isn’t simply is having a banner year with the Red Sox—a campaign in which he has continue to slowly build upon his previous years in the majors built upon his previous upon each year in the majors—he’s setting milestones. He joined teammate David Ortiz in the 30-100 club this season, along with a very short list of Red Sox greats who have done so before age 25.:

Rk Player HR RBI Year Age Tm
1 Jim Rice 39 114 1977 24 BOS
2 Ted Williams 37 120 1941 22 BOS
3 Ted Williams 36 137 1942 23 BOS
4 Nomar Garciaparra 35 122 1998 24 BOS
5 Ted Williams 31 145 1939 20 BOS
6 Mookie Betts 30 100 2016 23 BOS

(Source: Baseball Reference Play Index.)

Betts is crushing even the highest expectations set for him, all for a team that has baseball’s best offense in baseball and fine odds of producing another red October on Yawkey Way.

And all from that cute-as-a-button frame: 5-foot-9 and just 180 pounds. Baseball history generally tells us that it just isn’t likely that someone of that build, no matter his baseball acument, could possibly hit for as much power as we’ve seen Betts hit for.

In this year’s 2016 BP annual, Betts’ player comment says that he “showed off more power than most thought he possessed.” That was in 2015, when Betts hit 18 home runs and slugged .479. Baseball still has three solid weeks left of play, and through Tuesday, Betts is slugging .550 and has more home runs than Mike Trout, than Anthony Rizzo, than Yoenis Cespedes. (He has three more than Buster Posey and Brandon Belt combined.) And this isn’t one of those Boston power flukes, like Jacoby Ellsbury or Bill Mueller’s spikes. Betts’ power numbers have been climbing from season to season, outdoing the already high expectations set forth for him.

Take a look at Betts’ slow but sure progression over his time in the majors:

Slash Line

K%

BB%

ISO

2014

.291/.368/.444

14.6

9.9

.153

2015

.291/.341/.479

12.5

7.0

.188

2016

.317/.358/.555

12.5

6.3

.238

Betts’ strikeout rate has always been surprisingly low for only having three years of major-league experience under his belt, and while his walk rate has gradually gotten lower each season, his power numbers have increased, and now Betts has the second best slugging average and ISO on the Red Sox juggernaut offense, only behind David Ortiz. (Fun fact: Betts hadn’t yet started kindergarten when Ortiz made his major-league debut.)

Betts currently is among the top 20 American League batters in ISO, and surrounding him are not exactly the type of guys you’d imagine him sitting at a table with. These guys are all major league veterans, they’re older, and they’re bigger than Betts:

Player (ISO Rank)

Slash Line

K%

BB%

ISO

Miguel Cabrera (15)

.316/.389/.556

16.8

10.6

.241

Todd Frazier (16)

.218/.301/.458

24.5

10.3

.240

Mookie Betts (17)

.317/.358/.555

12.5

6.3

.238

Mike Napoli (18)

.255/.344/.452

30.3

11.6

.236

Robinson Cano (19)

.305/.354/.535

13.9

6.3

.231

By any measure but performance, Betts looks like the kid eating at the grownups table. But he possesses not only the talent to post comparable numbers to these sluggers, but something that has recently eluded this group: speed. Betts is hitting for power, he’s getting on base, he has the speed to extend his hits, and he’s striking out at significantly lower clip than these hitters, with the exception of Cano. His low walk rate, much like Cano, is compensated for by the fact that he’s still getting on base at the third-highest rate of these five players.

Betts’ approach at the plate isn’t characterized by patience, and if anything he has become less patient, seeing fewer pitches per plate appearance each season as he ambushes early strikes. (The one season he did walk at a nearly 10 percent clip, he had the highest OBP of his career—but the lowest slugging percentage.) His approach is characterized by using his good eye at the plate to exploit his power.

Meanwhile, he has sharpened his ability to cover the entire plate. Take a look at the progression in Betts’ slugging maps from 2015 to 2016, first on hard pitches:

And on breaking pitches:

Now, to say that Betts struggled against either type of pitches in 2015 wouldn’t exactly be true, Betts simply improved his plate coverage from 2015 to 2016. The difference is night and day.

Betts’ candidacy for the AL MVP award is in limbo right now, hinging as much (more, actually) on the Red Sox’ team performance in these final weeks as Betts’ own. For now, he’s in the discussion as one of the most important cogs in baseball’s best offensive machine. But if Boston fades, Betts has got an entire career ahead of him. Just two years and two months into that career, he’s already shown the ability to continue improving, and to exceed the expectations set for him. Betts is proving the very concept of a ceiling wrong.