Wednesday, 23-year-old fireballer Alex Reyes returned to the mound for the Cardinals after a long and arduous return from Tommy John surgery. He threw four scoreless innings against the first-place Brewers, but was removed after just 73 pitches. Obviously, there was concern with the early hook and the Cardinals passed along that Reyes had "arm fatigue." 

The velocity indicated there was an issue (via the excellent Brooks Baseball): 

brooksbaseball-chart.jpg

Reyes struck out two hitters in the first inning and none in his final three. 

The picture looks like someone who isn't right. And he wasn't. 

Thursday, the Cardinals announced that Reyes was placed back on the disabled list due to a right lat strain. It likely won't be a short stay, either, per Cardinals general manager Mike Girsch:

This is pretty concerning. Reyes missed over a month with a shoulder injury in 2015 and later had the aforementioned Tommy John surgery. His career high for innings in a season is 109 1/3. It's getting pretty alarming, though he's still only 23. 

Overall, what a bummer after finally getting him back for St. Louis.