One of the easiest conclusions to draw from the Tigers’ first few weeks is that Casey Mize has looked like a different pitcher than the one many fans were worried about a couple of years ago. Entering Wednesday night’s start against Milwaukee, he owns a 2.78 ERA over 22.2 innings, and the strikeout-to-walk profile behind that number is strong: 26.6% strikeouts, 7.4% walks, and a 3.14 FIP. That is not the profile of a guy merely surviving on batted-ball luck.
What makes the start even more interesting is that public defensive metrics say the Tigers have not exactly been doing him favors. A chart that circulated this week showed Mize among the pitchers most hurt by team defense early in the season, and Sporting News summarized the point by saying he was tied for the most negative defense-behind-the-pitcher Outs Above Average mark in baseball. In the screenshots shared here, Mize is shown at -4 runs prevented and -5 OAA behind him.
That stat needs a little translation. Baseball Savant’s pitcher-view OAA page makes clear that this leaderboard is not grading the pitcher’s own glove. It is measuring how the defense performed behind him while he was on the mound. In other words, this is about chances that should have become outs and did not. It is not just an error count, and it is not just bad luck in the traditional sense. It is a measure of whether the fielders behind a pitcher are converting batted-ball opportunities the way an average defense should.
The important part is that Mize is not some total innocence-pleading victim of weak gloves. His underlying line is good, but it is not flawless. Statcast has him at a 3.59 xERA, a .304 xwOBA allowed, and a 45.9% hard-hit rate, so there is still some loud contact in the profile. That is why the better way to say it is this: Detroit’s defense is making a promising start harder, not inventing it out of thin air. Mize has earned most of the praise he is getting.
You can see that clearly in the game log. Before Wednesday’s start, Reuters noted that outside a rough April 6 outing against Minnesota in ugly weather, Mize had allowed only two runs across his other three starts. His latest outing was the cleanest example: 6 2/3 scoreless innings, only three hits and one walk allowed, and seven strikeouts against Boston. Detroit still lost that game 1-0 in 10 innings. That is the kind of start that reminds you how small the margin can be when a pitcher is not getting much help around him.
The broader team numbers point in the same direction. FanGraphs’ team fielding snapshot had the Tigers 27th in Def and 27th in OAA through April 22, while ranking fourth in catcher framing. That split matters. It suggests the biggest issue is not receiving pitches or stealing strikes for the staff. It suggests the bigger issue is range, coverage, and turning balls in play into outs. For a pitcher like Mize, who is throwing well enough to win without having to be perfect, that matters a lot.
There is still an early-season disclaimer attached to all of this. Four starts is not enough to lock any narrative in place, and defense-behind-a-pitcher metrics can swing fast in April. But the core takeaway holds up: Mize’s opening month looks legitimate, and if Detroit’s gloves catch up to its pitching, his numbers may wind up looking even stronger than they do right now.
