Scott Harris smiled and answered the question with a joke.

"I don't know if you guys noticed," Harris said, "but we pay attention to waivers."

The Detroit Tigers, as expected, were paying attention to the waiver wire in mid-February when the Arizona Diamondbacks removed left-hander Tyler Holton from their 40-man roster. The Tigers claimed Holton off waivers, and the rest is history.

"We're always trying to find ways to get better," continued Harris, who recently completed his first full season as the franchise's president of baseball operations. "The combination of the pure stuff, the strike throwing and the deception that he had in Arizona is what really intrigued us initially, and he got a lot better here."

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Holton, whom the Tigers promoted from Triple-A Toledo in mid-April to replace struggling reliever Garrett Hill, posted a 2.11 ERA with 18 walks and 74 strikeouts over 85⅓ innings in 59 games out of the Tigers' bullpen in the 2023 season.

He threw 93 innings (in 63 games) over his time with the Mud Hens and Tigers.

He had a 7.04 ERA in Toledo.

"I was looking at the Triple-A innings, and I was like, 'Dang, I had a 7 ERA,'" Holton said. "I was doing horrible, but I have the same mindset that I did back then, to put up zeros. Go out there, grind, put up zeros and help our team win the game. That mindset never changes. But yeah, I definitely surprised myself."

The Tigers claimed Holton for multiple reasons, but his ability to command the entire strike zone with five pitches — which turned into six pitches following the addition of a slider — allowed him to attack all types of hitters in different ways.

His 5.6% walk rate ranked seventh among 44 left-handed pitchers (and 24th among 172 total pitchers) with at least 80 innings. His 2.11 ERA ranked No. 1 among those 172 pitchers, ahead of Blake Snell (2.25) and Clayton Kershaw (2.25).

For Holton, the primary attribute that separates him from other relief pitchers stems from a mantra he learned in college, from 2016-18, at Florida State: "Any pitch, any time, any count, throwing three pitches for strikes."

The slogan, abbreviated to AAA 3-4K, was preached by former Florida State pitching coach Mike Bell. Since then, Holton has added three more pitches to his repertoire.

"He is the true definition of a pitcher," said Bell, now Pitt's head coach. "His ability to attack the strike zone has allowed him to have success. A lot of people looked at him like he's not a big-league pitcher. No, he's a professional pitcher, and he's a damn good one."

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In 2023, Holton threw six different pitches: 27.9% four-seam fastballs, 22.5% changeups, 19.3% cutters, 14.3% sliders, 12.3% sinkers and 3.6% curveballs. His four-seam fastball averaged 91.5 mph but limited opponents to a .178 batting average.

With the Tigers, Holton added a slider, learned to sequence his pitches and used his body to create deception. He had the foundation built, and then the Tigers optimized him.

"What we were learning at school was that you need to have confidence to throw three pitches for strikes," Holton said. "It's no longer three pitches for me, but whatever pitch it is, I need to be able to throw it at any time in any count."

Another thing Holton learned from Bell: "You don't have to throw a strike to get a strike." That meant Holton didn't need to live within the confines of the strike zone and could get strikes in many ways, including an out-of-zone chase, a foul ball or an in-zone called strike.

Doug Drabek, a former National League Cy Young winner and the pitching coach for Triple-A Reno in the Diamondbacks' organization, watched Holton learn by trial and error under his instruction with Reno in 2022 and Double-A Amarillo in 2021.

The walks weren't an issue, but he kept giving up hits.

Holton learned a sinker and a cutter from Drabek during their two seasons together in the Diamondbacks' organization. He implemented both pitches because he needed to protect his low-velocity fastball.

"It was all there, but he needed to learn, at times, how to waste a pitch for the next pitch to be an out pitch," Drabek said. "The control was there, but he was giving up too many hits."

Holton allowed 11.5 hits per nine innings in 2021 and 7.9 hits per nine innings in 2022, compared to a much-improved 5.9 hits per nine innings with the Tigers in 2023.

Something changed during his time with the Tigers.

"You don't have to throw a strike to get a strike," Holton said. "Sometimes, you have to learn the hard way. It's reading hitters' tendencies. It changes batter to batter, day to day."

Learning the slider

A key change occurred in spring training. That's when the Tigers — pitching coach Chris Fetter and assistant pitching coaches Robin Lund and Juan Nieves — helped Holton develop an above-average slider for the first time in his career.

The southpaw tinkered with a slider in the offseason, and even considered tweaking his cutter, because he needed a swing-and-miss pitch against left-handed hitters.

"It was definitely a progression," Holton said. "I wanted to go away from it and forget about it. I thought about going back to my curveball and then trying to make my cutter bigger. But I didn't really have that much success against lefties with that philosophy last year, so we kept trying to change the grip."

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Holton tried four or five different slider grips.

He regained confidence in the lengthy process during a session with Triple-A Toledo bullpen catcher Nate Alter in early April. Holton remembers throwing six sliders in the dirt before one of them hit the glove with the optimal movement.

Upon joining the Tigers in mid-April, Lund explained the concept of "seam-shifted wake" and tweaked Holton's grip again. (The Tigers hired Lund, a former kinesiology professor, in November 2022.)

"I hadn't heard of (seam-shifted wake) until this season," Holton said. "Finally, I had one bullpen where I had a lot of confidence and was able to execute it four or five times. The coaches were like, 'All right, we'll give it another week before you use it in games.' I threw it in the game one time because I had a leverage count where I could expand. That's when I knew I could do this."

Opponents hit just .135 with two extra-base hits off Holton's slider in the 2023 season. He threw 164 of his 171 sliders to left-handed hitters and 254 of his 269 changeups to right-handed hitters.

The slider generated a 37.8% whiff rate.

Implementing a dominant slider into Holton's repertoire is an example of the Tigers' new strategy to find wins in the margins by improving undervalued depth players.

"The slider that he is throwing now has a lot more sweep than it had before," Harris said.

The Harris way

Harris has claimed 17 players off waivers — but none since late August — since the Tigers hired him in September 2022 to lead the baseball operations department.

A couple of the players, such as Holton and infielder Andy Ibáñez, stand out more than others, but the Tigers might not have picked up Holton back in spring training if Harris wasn't obsessed with low-risk opportunities on the waiver wire.

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Holton represents a big win for Harris.

"He came here, got a lot better and put up one of the best seasons of any reliever in baseball," Harris said, "both in terms of the amount he pitched and the quality of his performance."

The Tigers plugged him into a multi-inning role from the onset of his promotion to the big leagues. He recorded more than three outs in 33 of his 59 appearances, more than six outs in eight of his outings and at least nine outs in three of his outings.

Holton, though, worked his way into high-leverage situations.

His MLB percentile rankings were elite. He finished in the 93rd percentile with an 86.1 mph average exit velocity, in the 88th percentile with a 5.6% walk rate, in the 81st percentile with a 31.8% chase rate and in the 77th percentile with a 3.53 expected ERA.

"I'm not surprised at the fact that he's helping somebody win, or putting the Tigers in a position to win games, because he's a winner," said Bell, who watched Holton lead Florida State to the College World Series in 2017. "That's who he is."

It didn't cost anything for the Tigers to claim Holton off waivers from the Diamondbacks, and he won't become a free agent until after the 2028 season.

He is an important part of the future.

"He's earned everything he's ever gotten," Bell said. "He's not the top-100 prospect that everybody recruited out of high school. He's worked for everything. He's a confident — but not arrogant — competitor. He's that silent assassin."

Contact Evan Petzold at epetzold@freepress.com or follow him @EvanPetzold.

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This article originally appeared on Detroit Free Press: Detroit Tigers' Tyler Holton went from waiver claim to proven reliever