What JJ Wetherholt’s Success Means for the Cardinals’ Future

JJ Wetherholt didn’t need an All-Star nod to change the St. Louis Cardinals for the better. He’s refined the leadoff spot, transformed the Cardinals’ defense, and potentially even sped up their timeline. 

On July 10, the Cardinals expressed their unwavering belief in the rookie with a long-term deal. The contract spans eight years, with a base salary of $112.5 million ($14.1 million AAV). With incentives, it could jump to $132 million. 

It’s clear that he’s a key part of St. Louis’ future – and for good reason. 

Wetherholt, 23, is the current favorite for NL Rookie of the Year. According to BetMGM, the West Virginia product jumped from +500 odds in the preseason to a jaw-dropping -155 through July 9. 

After taking the top-end talent seventh overall in 2024, St. Louis wasn’t hesitant to challenge its first-round pick. Wetherholt started his first full season with the org in Double-A and ended up coasting to Triple-A by the end of the year. Turns out, one full season was all he needed to equip himself for The Show. 

Through 395 PA, Wetherholt ranks in the top 15 in fWAR across baseball and has become a steady presence at the forefront of the St. Louis lineup. 

Among his many talents, consistency, poise, and demeanor stand out most of all. Wetherholt doesn’t look like a 23-year-old rookie: He’s taking at-bats like a grizzled veteran with a stone-cold approach.

But what actually makes him so special? 

All stats pulled for this piece prior to games on July 10.

How Has JJ Wetherholt Put Together Such an Incredible Start? 

Ahead of the season, Wetherholt was expected to be a league-average fielder at best and a solid hitter after adjustments kicked in. 

He’s been all that and then some. 

On offense, Wetherholt’s bat-eye is a major strength. He ranks in the 73rd percentile or better in whiff percentage, strikeout percentage, chase percentage, squared up percentage, and xwOBA. All of which demonstrate his veteran-like ability not only to put the ball in play, but also to lay off the “pitchers’ pitches” that often give rookies fits. 

Fortunately, Wetherholt’s vision isn’t the only thing that’s 20/20. The most surprising aspect of his game has been the power tool that’s translated into 13 first-half bombs. At this rate, he’ll be the 18th rookie in MLB history to record a 20/20 season – the most recent being Brewers’ Jackson Chourio in 2024. 

Underlying metrics still aren’t sold on Wetherholt’s power surge. However, the up-and-comer has yet to be bewildered by expectations. Just look at the other side of the ball. 

In 2025, MLB Pipeline gave Wetherholt a 50-grade in arm strength and overall defense. He’s now transformed the Cardinal infield. 

Groundball pitchers have been an infamous strategy in St. Louis. Before 2026, the Cardinals would string together pitching staffs based on reliability and experience, opting for safety over upside. 

Unfortunately, some groundballs have eyes and can even navigate around Gold Gloves. Masyn Winn has restored order at shortstop since his cleats hit the dirt, but the rest of the St. Louis infield was a wasteland. 

Wetherholt has completely overhauled the Cardinals’ infield defense. His 100th percentile OAA and fielding run value play alongside a 2025 Gold Glove winner in Winn, and he’s on track to nab hardware of his own.

Teams like the Cardinals, who win on the margins, can’t afford mistakes in the field. After a brutal five-game series against the Milwaukee Brewers, their record sits at 48-43. Interestingly enough, by Pythagorean win-loss, they should be a mere one game above .500. 

Regression has been warded off by stellar defense, clutch hitting, and a 23-year-old rookie who’s already making waves. 

Still, what exactly are the Wetherholt waves? And how has St. Louis’ tide shifted since his arrival? 

How Does JJ Wetherholt Impact the Cardinals Moving Forward? 

So much has changed since Wetherholt debuted in The Lou. St. Louis baseball has a different vibe, and it’s directly tied to his success. 

For starters, Wetherholt’s establishment of the leadoff spot has cultivated a lengthy lineup. Before he spearheaded the Cardinals’ offense, they’d struggled to find a serviceable option. Winn and outfielder Lars Nootbaar had taken turns, but neither looked the part. 

Wetherholt has a .793 OPS when leading off a game this season with four leadoff home runs. Additionally, he sees an egregious number of pitches, no doubt aiding the rest of the Cardinals’ offense. 

And he hasn’t just solved the leadoff problem. He’s also providing a new layer of depth on defense.  

Entering 2026, the Cardinal defense revolved around Winn. If he floundered, then St. Louis’ infield would follow. 

Thanks to Wetherholt, the Cardinals have a kind of flexibility they’ve lacked for years. His ability to play second base, shortstop, and third base is exactly what a rebuilding team needs. 

Winn is nowhere near being ostracized, as he remains one of MLB’s best defensive shortstops. However, the blueprint for infield defense has a new kind of depth that’s extremely reassuring. 

Wetherholt has also given the Cardinals’ front office a reason to contemplate. 

St. Louis built a roster that looked like it was made in a lab to be torn apart come July. Then, with Wetherholt leading the charge, they leaped into competitiveness. 

There’s no clear evidence that the Cardinals will buy into this team’s success, but the mere idea that they have the chance to is a direct reflection of how far they’ve come. 

Wetherholt has stabilized the top of the order, reinvented the infield’s defense, and potentially sped up St. Louis’ timeline. He hasn’t just been a calming presence in 2026; he’s a crystal ball into the future. Without him, things get blurry, fast. 

His contract gives the Cardinals a baseline for their next cohort of talent. As stated by the team’s chief executive officer, Bill Dewitt III, this is hopefully the first of many extensions for a blossoming, young core. 

If Wetherholt’s rookie year resembles anything, it’s the next wave of Cardinal baseball. He’s gifted St. Louis every team’s prized possession when reconfiguring: a foundation.