Under The Knife 6/30/26

Birthday Edition

YANDY DIAZ, 1B TBR (strained shoulder)

Does anyone care that Yandy Diaz leads the league in batting average? When I first joined Baseball Prospectus, Albert Pujols led the league with a 359 average, but no one talked about his hitting ability, they talked about his power. Bill Mueller, who led the AL, was no Stan Musial, but he was considered a key part of the Boston Red Sox resurgence, alongside Manny Ramirez, who was just behind him. Luis Arraez is still valuable, but he’s been a trade deadline asset more than a considered-great hitter despite doing it year after year.

Diaz now finds himself day to day with a shoulder strain and the assumption is often that this matters more for sluggers than hitters whose game revolves around contact. That’s selling hitters like Diaz short. Elite bat-to-ball ability depends on precision. Diaz doesn’t simply put the barrel on the ball. He consistently squares it up because his swing is remarkably repeatable. The shoulder is central to that. It stabilizes the lead arm through the zone, helps control the barrel, and allows a hitter to make those tiny adjustments that separate a line drive into right-center from a harmless popup. A sore shoulder doesn’t have to sap home-run power to make a batting champion look ordinary.

The encouraging part is that the Rays are calling this a muscular issue rather than something involving the labrum or rotator cuff. Those injuries tend to respond much more quickly once inflammation settles. Players like Freddie Freeman and José Altuve have played through minor shoulder strains in recent years, but both saw stretches where their timing looked just a little off before normal production returned.

That’s what I’d watch with Diaz. Not whether he hits a ball 430 feet. Whether he’s pulling outside pitches foul, rolling over ground balls, or just missing the sweet spot by an inch. Those are often the first signs that the shoulder isn’t quite cooperating. The Rays are wise to call him day to day. Shoulders have a habit of feeling fine in the training room and reminding hitters they’re still there the first time they face a 97 mph fastball. For someone whose game is built on making difficult things look easy, that last little bit of comfort matters more than most.

Thanks for letting me take a weekend. I went up to Chicago and two notes: A) Iceboy, starring Nick Offerman and Megan Mullaly, is hilarious and goofy. Really fun, really funny, but lacks a solid score and needs a signature song. Even as a comedy, the musical part is the weakest. B) Bavette’s in Chicago ranks as one of the best steaks I’ve ever had. I went to Harry Caray’s the night before - remarkable - but just down Kinzie, Bavette’s is next level. Better, Molly Gordon was in the bar and I needed a Bear moment after watching the finale. Oh and Injury Territory is out with a great interview with Mike Reinold.