It's Time to Bench Ian Happ in Favor of Owen Caissie

From the outset, the outfield seemed like the most settled unit for the 2025 Chicago Cubs. The trio of Ian Happ, Pete Crow-Armstrong, and Kyle Tucker was going to be a tough one to move (barring injury), with Seiya Suzuki ready to step in for work as a fourth outfielder. This, naturally, led to some questions as to the future of two of the team's top prospects, Owen Caissie and Kevin Alcántara. 

Between the two, Caissie began to make an urgent case for himself as the temperature climbed. Turning in a 142 wRC+ and some massive power figures (.277 ISO) with Iowa, the banging on the big-league door became rather loud as the summer progressed. Despite some trade chatter in connection with controllable pitching, the team held on to Caissie and called him up earlier this month. 

To date, Caissie has gotten work across eight games at the major-league level. Three of those have been as a pinch-hitter, one (his debut) was as a designated hitter, and three came in relief of Kyle Tucker during his "reset." As the early results across his first 20 plate appearances have been solid (115 wRC+, .211 ISO), the fans' clamor for regular duty has become more pointed. However, that same question persists: when and where do you play him? 

It's actually not a particularly difficult question to answer.

All three starting outfielders are healthy, with the weekend series in Anaheim showcasing a return to form for Tucker and (to an extent) Crow-Armstrong. That leaves two options. Either you're playing him in left in relief oHapp, or you're rolling him out as a DH, to get Suzuki a reset of his own. In the latter's case, however, the process is still manifesting—as it always has. It's something of a flawed process, in that Suzuki is likely far too patient at the plate, but it's a process, nonetheless. The hope is that luck starts falling his way with a little more regularity, and you take the occasional strikeout looking in favor of the on-base and power output he was demonstrating earlier in the year. That leaves just one option.

Anecdotally, there's been a bit of a weird thing transpiring on the Marquee Network broadcasts and social media at large: they keep declaring that Ian Happ is starting to round into form. The issue with that line of thinking is that, at this point, it remains unequivocally false. 

Happ's full-season numbers are the worst he's turned in since 2021. He's at a wRC+ of just 103, with a slash that reads .226/.330/.380. He's been almost entirely propped up by his walk rate (13.4%) since the start of the year, with the slug dissolving in a way that we haven't seen at any point during his career; a .154 ISO represents a career low, by 15 points. Couple that with baserunning concerns wrought by an apparent speed decline, and one starts to wonder how the veteran continues to draw regular work over Caissie. His glove is an asset in left field, but that's not a defense-first position.

The very notion of a resurgent Happ is an exercise in drawing your preferred endpoints. After an atrocious (.179/.304/.333) July, he's been markedly better in August (.217/.353/.333), but notice that the righthand column hasn't moved. No one was especially happy with the way he'd hit through the end of June (.241/.331/.403), but he was better then than he's been in either month since. Happ's own confidence in a return to form sounds as rooted in his manager having assured him he'll play as in any key adjustments.

That state of affairs can't last, though. Not when you've got such massive upside in Caissie, and so little left in Happ. 

Everything with Caissie is in the smallest of samples, so far. But the offensive output has been solid, with plenty of room for growth. The strikeout rate is high (25.0%), but he's compensated well with the power output (that .211 ISO) courtesy of a 14.3% barrel rate and a 74.7 MPH average swing speed. Even better is the fact that he runs well—his 27.8 ft/sec sprint speed checks in just slightly behind Suzuki and Willi Castro—while providing steady defense in his own right. 

Happ and Suzuki pose similar dilemmas, when evaluating them as candidates to lose time to Caissie. Both are overly patient hitters in the midst of pretty intense struggles. However, Happ's power output remains fairly limited, on top of his other shortcomings being demonstrated. If Suzuki gets right, the upside is higher—and his recent track record gives us more reason to believe that’s possible. He's also a righty batter, whereas Happ (a switch-hitter who's better as a lefty) overlaps with Caissie more in a profile sketch.

As we know what the upside is and we know what the swing data says Caissie can provide, there is only thin justification to run Happ out in left field over the youngster. Caissie's defensive chops have closed the gap on his veteran teammate, too. It's time to take a chance on the rookie.