In return for closer Addison Reed, the Mets acquired right-handed pitching prospects Jamie Callahan, Gerson Bautista and Stephen Nogosek.
The Mets announced Tuesday that Nogosek and Bautista will report to Single-A St. Lucie, while Callahan will begin play with Triple-A Las Vegas.
In return for Lucas Duda, the Mets acquired right-handed pitching prospect Drew Smith, who was assigned to Double-A Binghamton last week.
Who is Jamie Callahan?
Callahan, 23, was ranked Boston's 13th-best pitching prospect, according to MLB.com, which wrote in June that he is ready to help as a big-league middle reliever.
He was drafted as a starting pitcher, but moved to the bullpen in 2015.
"He keeps getting better with experience as a reliever, excelling in the Arizona Fall League after last season and earning a promotion to Triple-A this May," MLB.com wrote in June. "If he continues to deliver strikes, he should be able to help in a middle-relief role later this season."
Jamie Callahan warms up in the bullpen in the seventh inning against the New York Yankees in Fort Myers, Fla., on Tuesday, Feb. 28, 2017. (AP Photo/David Goldman)
According to multiple scouting reports, Callahan uses a 94-96 mph fastball, a slider and an upper-80s cutter. He had a change up a starting pitcher, but does not use it in relief.
In 22 appearances in Triple-A this season, Callahan is 1-1 with a 4.03 ERA, four saves, 13 walks and 36 strikeouts in 29 innings pitched.
Matthew Cerrone: Callahan is the short-term get here, since he can help this season and next. I heard from a few people today that he has a really nice slider. He has historically struggled with his command and control. He's doing better with it this season. If that continues, he can be a useful arm as soon as this August and September and certainly next season.
Who is Stephen Nogosek?
Nogosek, 22, was considered Boston's 10th-best pitching prospect, according to MLB.com, who believes he is on track to make his big-league debut in 2019.
In 36 starts in Single-A this season, Nogosek is 4-4 with a 3.06 ERA and 63 strikeouts in 53 innings, during which opponents are hitting .212 against him.
Nogosek pitches for the Oregon Ducks in 2015 (MARK HUMPHREY/AP)
"Nogosek's control of his pitches fluctuates at times, but he generally throws enough strikes to keep himself out of trouble," MLB.com wrote in a scouting report this past winter. "If he continues to miss bats, he'll advance quickly."
According to multiple scouting reports, Nogosek has a slider, change up and a swing-and-miss, mid-90s fastball that has a lot of spin.
Matthew Cerrone: I'm told this guy has the highest ceiling of the three pitchers. From what I can gather, Boston struggled to lock him in to a role. And, it's possible, the constant bouncing around (from starter to reliever) stunted his development and caused a lot of command issues. If what these scouts say is true about his spin rate, repertoire, delivery and make up, he reads to me like a reliever. But, I can see from his numbers and grading why the Red Sox were tempted to put him in a rotation. Hopefully the Mets will handle him in a better way.
Who is Gerson Bautista?
Bautista, 22, was considered Boston 16th-best pitching prospect, according to MLB.com, who believes he could be ready to pitch for the Mets during 2019.
Bautista was signed by Boston as a starting pitcher and moved to the bullpen in 2016, at which point he started to reach 100 mph with his sinking fastball.
"Bautista has a quick arm, but there is some unconventional action in his delivery that makes it difficult for him to maintain a consistent line to the plate, which leads to wavering command," Baseball America's Vince Lara-Cinisomo wrote in a review of today's trade. "His best secondary pitch is a slider that shows depth, but is inconsistent, and he tends to overuse it at times."
In 27 relief appearances in High-A this season, Bautista is 3-2 with a 5.16 ERA, four saves and 53 strikeouts in 45 1/3 innings pitched.
MLB.com's Jonathan Mayo wrote in June that, if Bautista can smooth out his delivery and refine his command, he could develop into a set-up man.
Who is Drew Smith?
Smith, 23, who was a third-round pick in 2015, was ranked by MLB.com as Detroit's 15th-best prospect in February, after which he was traded to the Rays before landing with the Mets.
Drew Smith with the Rays. Credit: @RaysBaseball on Twitter in April, 2017
"Smith is largely a fastball, breaking ball short reliever," MLB.com wrote in its most recent scouting report. "His heater will sit comfortably in the 92-95 mph range, and he can reach back for more, all from a clean and easy delivery. He'll show an above-average curveball at times with really good snap to it, but not consistently."
In 31 combined games across three minor league levels this season, Smith has a 1.60 ERA with seven saves and 40 strikeouts in 45.0 innings. In 79 career minor league games, he has a 0.96 WHIP with 140 strikeouts in 125 innings.
"He has all the ingredients to be an effective short reliever, with a ceiling of a future setup man," MLB.com concluded, noting that Smith is capable of making his big-league debut this season.