Is Tanner Houck’s future with the Red Sox as a starter or reliever?

Earlier this month, Bleacher Report’s Joel Reuter identified Tanner Houck as a potential breakout candidate for 2022, citing that the Red Sox right-hander has “proven he has the stuff to miss bats at the MLB level” and it is now “just a matter of doing it over a full season” in Boston’s starting rotation.

After a stellar — albeit brief — three-start debut in 2020, Houck embarked upon his first full big-league season earlier this year. The 25-year-old made the Sox’ Opening Day starting rotation out of spring training and made his impact felt immediately by striking out eight while allowing just three runs (two earned) on six hits and one walk over five innings of work against the Orioles on April 3.

Houck was used out of the bullpen in a game against the Rays two days later and was then optioned to the Red Sox’ alternate training site. He was recalled from the alternate site to serve as the 27th man and start Game 1 of a doubleheader against the White Sox on April 18, but that would mark his last major-league outing for quite some time.

Upon getting sent back down to the alternate site, Houck was lined up to start the first game of the minor-league season for Triple-A Worcester against the Buffalo Bisons on May 4. He did just that, but wound up suffering a sore flexor muscle in his right arm that resulted in him getting shut down.

It took a little more than a month for Houck to return to the mound, and he ultimately found his way back to the Red Sox’ pitching staff on July 16. From that point forward, the 6-foot-5, 230 pound righty was used as a starter 11 times and as a reliever four times across five separate stints with Boston to close out the regular season.

All told, Houck posted a 2.58 ERA and 3.52 FIP to go along with 87 strikeouts to 21 walks over 18 appearances (13 starts) and 69 innings pitched in 2021. He also put up a 5.23 ERA (5.30 FIP) in 10 1/3 innings of relief in the postseason.

Houck’s first full season in the majors may have been a productive one, but it was also one that left us with some lingering questions. For starters, can Houck make it in the big-leagues as a starting pitcher?

This has been a prevalent topic since the Red Sox selected Houck with the 24th overall pick in the 2017 amateur draft out of the University of Missouri, and it is one that remains relevant today.

In the 13 starts Houck made for Boston this past season, he averaged less than five full innings per start and only made it to the sixth inning on two occasions. The primary reason Houck was held back in his starts had to do with his struggles when facing the same lineup multiple times.

When going through a lineup for the first time as a starter in 2021, Houck pitched to the tune of an impressive 1.50 ERA and 2.04 ERA across 30 innings. When going through a lineup for a second time as a starter, he still produced a respectable 3.81 ERA and 2.09 FIP across 26 innings.

Once Houck faced the same lineup a third time through is where things started to get dicey, though. In a small sample size of 2 2/3 innings pitched, the young hurler got lit up for nine runs (eight earned) on seven hits, no walks, and two strikeouts. That’s good for an ERA of 27.00 as well as a FIP of 9.01 and OPS against of 1.489.

What led to the difficulties Houck encountered when going through a lineup multiple times? Well, the answer to that question may lay within Houck’s pitch usage.

Since debuting for Boston last September, Houck has very clearly favored his fastball and slider, but has also been working to incorporate a splitter as a third pitch that he first began throwing last year.

This past season alone, the Missouri native threw 443 four-seam fastballs, 426 sliders, 195 sinking fastballs, and 85 split-finger fastballs, per Baseball Savant. Of those offerings, Houck’s slider was undoubtedly his best pitch as he held opposing hitters to an expected batting average of .144 while producing a 42.4% whiff rate with it.

As far as the splitter is concerned, Houck relied on the pitch in 2021 (7.4%) more than he did in 2020 (3%) and yielded positive results with it by allowing just one hit in 19 attempts while inducing a swing-and-miss 36.8% of the time.

“It’s a pitch that I feel confident in, and I’ve grown very much with it, so I’m excited to see where it takes me in the future,” Houck said of his splitter when speaking with FanGraphs’ David Laurila back in September. “I’ve had success with it as of late, throwing it off my slider, my two-seam, and my four-seam. I’m continuing to develop it, so I imagine that the usage will go up over time.”

Despite the success Houck enjoyed with his splitter and other pitches this year, the question remains as to whether he can stick with the Red Sox as a rotation regular or is rather best suited for a bullpen role.

During last month’s GM meetings, Sox chief baseball officer Chaim Bloom was — as’s Christopher Smith wrote — noncommittal to Houck or fellow righty Garrett Whitlock as members of the team’s 2022 starting rotation.

“I would say possibilities,” Bloom said when asked about Houck and Whitlock starting in 2022. “I have said this before, I think the ceiling (is for them) to be really good major-league starters. There are steps on the way to establishing themselves as that. I think it’s great that they have that upside. They’ve done it. They’ve came up as starters. … It gives us options and flexibility heading into the winter. So we’ll see how it all shakes out. We certainly want to have more depth either way. I have no doubt that if that ends up being their role, they would be very capable. It just might not be the best alignment for our team.”

Since that time, the Red Sox have obviously been busy in free agency when it comes to stockpiling rotation depth. In the wake of Eduardo Rodriguez departing for the Tigers, Bloom and his staff have added veteran pitchers with starting experience such as Michael Wacha, Rich Hill, and James Paxton leading up to Major League Baseball’s lockout taking effect in early December.

Once the lockout eventually ends and MLB’s transaction freeze is lifted, the Sox figure to be active in free agency and the trade market for starting pitchers yet again.

“I think the big thing for us is that we do know we want a number of capable arms, but it didn’t necessarily have to fall the way that it did,” Bloom recently said in regards to the additions of Wacha, Hill, and Paxton. “We love the guys we got, but we were in touch with the whole market. I think the key for us is to use our resources as best we can. We want to make sure we’re making what, in our mind, are good deals. Those can be small deals or they can be big deals.”

If the Red Sox were to sign another free-agent starter such as Carlos Rodon or deal for a controllable arm like Frankie Montas, that would only push Houck further down the club’s rotation depth chart.

Chris Sale, Nathan Eovaldi, Nick Pivetta, and Hill should be penciled in to be Alex Cora’s top four starters next spring. After that, it gets a bit murky since Paxton is coming off Tommy John surgery and Wacha may wind up in the bullpen.

With that, Houck will presumably have an opportunity to compete for a spot in the Sox’ 2022 Opening Day starting rotation once spring training arrives in a few months. Whether he comes out on top in that competition has yet to be determined.

(Picture of Tanner Houck: Mitchell Layton/Getty Images)


Author: Brendan Campbell

Blogging about the Boston Red Sox since April '17. Also support Tottenham Hotspur.

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