Dansby Swanson is Chasing Fastballs Again

Throughout his career, whether with the Chicago Cubs or in Atlanta, the key to Dansby Swanson's success at the plate has become increasingly evident. Regardless of whatever month-to-month variance he may be experiencing, he's a player who needs to lean on the fastball in order to drive his production. His time on the North Side has illustrated both sides of what that can look like. 

Last season, in particular, Swanson demonstrated the benefits of being fastball-focused. His .173 isolated power was his highest since 2021, with a hard-hit rate of 47.7%—the highest rate of his career up to that point, and a well-above-average mark. He hit 55.2% of his balls in play against fastballs hard and slugged .579 against them. That came in a season where he chased 27.1% of fastballs outside the zone, indicating that he was hunting them even at the expense of plate discipline (a trend he'd mostly managed to temper over the three previous seasons). 

That aggressiveness helped Swanson in the power production department, but nowhere else. He ended the 2025 season swinging more than ever (50.2%) and making contact at a rate lower than either of his two previous seasons with the Cubs (73.1%). Fastball hunting wasn't the sole reason for the higher-power, lower-contact results, but it was certainly part of the equation.

Alarmingly, we're starting to see some of those trends manifest again. It's not that Swanson was off to the hottest of starts in March and April, but there was some improvement there. He slashed .214/.344/.439 in the opening month, with a 122 wRC+. That latter figure was driven by a strong power output (.244 ISO) and an underlying 47.9% hard-hit rate. There was some improvement on the discipline front from last season, with a 39.8% overall swing rate and 21.5% chase rate, the latter of which included just 22.9% against fastballs. That helped him generate a walk rate over 16% through the end of April. We were comparing him to some of the game's most notorious three-true-outcomes dudes.

When the calendar flipped, though, Swanson began to run into some trouble. In fact, he's derailed. He's currently sitting at .158/.213/.246 for the month of May, with a wRC+ of just 30. His strikeout rate has fallen to a shade over 16%, but his walk rate has fallen by nearly 10 percentage points, too, to 6.5%. His ISO has cratered, at just .088. 

Some of that is bad luck; Swanson has a batting average on balls in play of just .174 this month. To an extent, though, you can work your way out of that via a quality approach. Whatever approach was working for Swanson in the first month, however, has gone the way of the rest of his output.

Here is Swanson's overall swing rate between the two stretches of play:

The overall swing rate has climbed, and not by a little. More worrisome, though, is the chase rate: 

The chase rate itself moving up 10 percentage points speaks to exactly the type of issues we've seen from Swanson during his periods of poor performance. Given what we know about Swanson and fastballs, that makes the following perhaps the most notable in all of this: 

It's one thing for Swanson to become more aggressive in trying to create offense. We've also seen the perils of attacking fastballs without any regard for the strike zone. His chase rate against fastballs has jumped by more than 20 percentage points, while his hard-hit rate against them has fallen by nearly that same number. Toss in the fact that his groundball rate, wrought by his increasing disregard for the zone in favor of the pitch type, has ballooned by 11 percentage points, and it's no wonder we're watching a player without much to offer at the plate right now. 

That it's a familiar issue doesn't make it a less frustrating one. The Cubs offense, as a collective, has largely sputtered of late without consistent power from Swanson on which to fall back. History tells us he'll work his way out of it by the time June runs around, but more recent history also makes us somewhat wary of the approach on fastballs that appears to be, for the second consecutive season, slipping from his control.