Craig Breslow has been impressed by Justin Slaten this spring.

When recently asked by The Athletic’s Jim Bowden about who has stood out to him at spring training thus far, Red Sox chief baseball officer Craig Breslow offered a simple, yet informative response.

“Slaten has been impressive,” Breslow said. “He’s shown the ability to get swings-and-misses in the zone on his secondaries with enough (on his fastball) to keep hitters off balance.”

Breslow is, of course, referring to right-hander Justin Slater, whom the Red Sox acquired from the Mets for minor-league lefty Ryan Ammons in the moments following the completion of December’s Rule 5 Draft.

Slaten’s journey to Boston has been somewhat unique. The 26-year-old had spent the previous five seasons in the Rangers organization after being selected by the club in the third round of the 2019 amateur draft out of New Mexico. He was then left off Texas’ 40-man roster this past November, which subsequently made him available to other teams on the final day of the Winter Meetings in Nashville.

The Red Sox, as noted by The Athletic’s Jen McCaffrey, had targeted Slaten as a top priority going into the Rule 5 Draft, but saw him cone off the board before they were set to pick. They then swung a trade with the Mets, who took Slaten eighth overall, by dealing away Ammons (a 10th-round selection in the 2023 amateur draft out of Clemson) as well as cash considerations to New York.

“It was kind of the marriage of the data, the raw pitch characteristics, the performance, the scouting group, everyone kind of aligned. This budding pitching infrastructure, we were able to get additional perspectives, and when there’s alignment across all of those groups, it makes for a fairly easy decision,” Breslow said at the time. “He’s a guy with huge swing-and-miss stuff, profiles as a back-of-the-bullpen type arm, so we’re really excited to get him here and see what he can do.”

As a Rule 5 Draft pick, Slaten was immediately inserted into Boston’s big-league mix and added to the 40-man roster. He took part in the club’s rookie development program in January, was at Winter Weekend in Springfield, and is now vying for a spot in the Sox’ Opening Day bullpen at major-league spring training camp down in Fort Myers.

Slaten is coming off a 2023 season in which he posted a 2.87 ERA (4.03 FIP) with 86 strikeouts to 20 walks in 40 appearances (one start) spanning 59 2/3 total innings of work between Texas’ Double-A and Triple-A affiliates. He allowed just one run on three hits, four walks, and 10 strikeouts across five outings (8 1/3 innings) after being promoted to Triple-A Round Rock in September, then struck out six over 3 2/3 frames of relief for the Surprise Saguaros in the Arizona Fall League.

So far this spring, Slaten has gotten into four Grapefruit League games for Boston. He has allowed only two hits, zero walks, and one hit batsman with four strikeouts over four scoreless innings in which he has held opposing hitters to a .133 batting average against. Considering that he last pitched on Tuesday, he could conceivably be used as part of this weekend’s Dominican Republic Series against the Rays in Santo Domingo.

“Velocity, movement,” Red Sox manager Alex Cora said of Slaten when speaking with MassLive.com’s Christopher Smith last month. “Obviously we’ve got to make sure he throws that over the heart of the plate. But so far, so good. Big boy with good stuff. I think if you look around, we’re a little bit bigger in that department this year. A lot of big bodies, a lot of big dudes with nasty stuff. So we’ve just got to make sure we throw that nasty stuff over the heart of the plate and take our chances.”

Standing at a sturdy 6-foot-4 and 222 pounds, Slaten operates with a four-pitch mix that consists of a 95-97 mph fastball, a mid-80s sweeping slider, an 89-91 mph cutter, and a low-80s curveball that features two-plane break. He demonstrated improved control last year and is currently regarded by Baseball America as the No. 28 prospect in Boston’s farm system, which ranks eighth among pitchers in the organization.

Even though he was not directly taken by the Red Sox in the Rule 5 Draft over the winter, Slaten still must stick on Boston’s active roster (or injured list, if he is hurt) for the entirety of the 2023 season. If those conditions cannot be met, the Sox will have to expose Slaten — who cannot be optioned to the minor-leagues — to waivers and then, if he clears, offer him back to the Rangers for $50,000.

Earlier in camp, it appeared as though Slaten and fellow pitching prospect Bryan Mata were competing for the same bullpen spot. Mata, like Slaten, was gunning to make the Opening Day roster since he is out of minor-league options and would be facing the possibility of being placed on waivers. He has since suffered a hamstring strain that shut him down from throwing until just recently.

As The Boston Globe’s Julian McWilliams highlighted on Wednesday, there is still no timetable for when Mata could be available to get into a game, which puts his status for Opening Day in question. The Red Sox could, however, place the hard-throwing 24-year-old on the injured list to start the season and delay their decision on what to do with him until he is physically cleared to return to action.

Regardless, Mata’s injury gives Slaten an advantageous edge for a roster spot with less than three weeks to go until the Red Sox open the 2024 season in Seattle on March 28. The fact Breslow has been impressed with him this spring certainly speaks to that.

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