Jack Flaherty’s season has started to look like two different stories stitched together.
For the first 12 outings, the Tigers were getting the wrong one. He carried a 5.81 ERA, Detroit dropped 10 of those games, and the right-hander was still trying to find his footing. But as he heads into the All-Star break, Flaherty is coming off a six-start stretch that looks much more like the pitcher the Tigers expected when they invested in him: a 2.12 ERA, three wins, and far better control of the damage he allows.
What makes the turnaround stand out is what did not change. Flaherty did not reinvent himself with a new pitch or a dramatic overhaul.
He kept working with the same arsenal. The difference was execution.
That shows up in the underlying numbers, too. His FIP fell from 4.64 to 2.47, a sign the improvement is tied to the things a pitcher can actually control - strikeouts, walks, and home runs - rather than just a lucky run of results.
Even the strikeout totals stayed fairly steady. Flaherty averaged 10.9 strikeouts per nine innings over his first 12 starts and 10.3 over his next six. He also did not suddenly become a much deeper starter, moving from 4.4 innings per start to 4.9.
The real shift came in the quality of his strikes. Early in the year, opponents were working him over with patient, productive at-bats.
He handed out 30 walks and allowed eight home runs over his first 52⅔ innings. In his next 29⅔ innings, he gave up just 10 walks and one homer.
That kind of cleanup changes everything. Flaherty did not need to miss a ton more bats to become more effective; he just had to stop giving hitters easy ways to hurt him.
His fastball tells the story best. Through his first 12 starts, opponents hit .266 with a .440 slugging percentage against it.
Over his last six starts, those numbers dropped to .140 and .200. The pitch’s strikeout rate also jumped from 11.5% to 26.3%, while hard-hit rate and barrel frequency went down.
The key was location. Statcast’s heat maps make the adjustment obvious.
In the early going, hitters punished fastballs left in the lower-middle part of the zone, batting .400 against pitches in Zone 8. They also hit .667 in the lower-away corner, Zone 9, and .364 in the upper-away area, Zone 3.
Over the last six starts, that picture flipped. Batters hit just .125 in Zone 8, .333 in Zone 9, and did not record a hit in Zone 3. The biggest gains came at the top of the zone, where Zone 2 went from a .333 average allowed to .000, and Zone 1 dropped from .200 to .000.
Instead of leaving fastballs in hittable spots, Flaherty has worked the edges more consistently and forced hitters into tougher swings. That’s a big reason the strikeouts have come easier.
The fastball wasn’t the only pitch helping him. His slider has produced more swings and misses while cutting down walks, and his knuckle curve has shown better expected metrics than the surface numbers suggest.
That mix showed up Thursday night at Comerica Park, when Flaherty threw six solid innings in Detroit’s 10-2 win over the Philadelphia Phillies. He gave up two runs, struck out six, and produced 14 swinging strikes. Half of his strikeouts came on the knuckle curve.
So now Flaherty leaves the first half with a season that feels divided in two. The opening stretch raised real concerns. The recent run reminded everyone why the Tigers believed he could anchor their rotation.
The only question left is which version Detroit gets next.
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