Roseboom, a 17th-round selection in 2014 out of the University of South Carolina Upstate, is 8-for-8 in save conversions since getting the assignment. Opposing batters are hitting .176 against the southpaw in 40 appearances this season.
Roseboom, 24, also handled closing in the South Atlantic League last season. His bigger transition was moving from a starting pitcher in college to exclusively relief work as a professional.
Roseboom’s fastball sits at 88-92 mph. He has a good feel for his changeup and also possesses a slider, which gives him a three-pitch arsenal out of the bullpen.
“I had never been a reliever, ever, in my career until I got drafted by the Mets and they put me in the bullpen,” Roseboom said. “I feel like being in the bullpen actually matches my mentality more. I’m kind of an aggressive type of person when I’m out there, more of a bulldog mentality. That’s really helped me a lot in the bullpen with my success early on in my career, and handling the adversity in St. Lucie last year -- the first time of actually struggling and just being able to put that behind me and move on and go out the next night and act like nothing ever happened.”
After opening last season with a 1.15 ERA in 24 relief appearances at Savannah, Roseboom stumbled upon getting promoted to the Florida State League. He had a 4.55 ERA and 1.611 WHIP with St. Lucie.
“When I first came up there, it wasn’t like the Sally League,” Roseboom said. “The Sally League I’d get away with a mistake, and a guy would swing through it. When I got to St. Lucie, those pitches more on average were hit -- guys put a bat on it. And a lot of guys when they put a bat on it, they hit it hard.
“And in my high-A debut, I took a comebacker off the bat of [Pirates catching prospect] Jin-De Jhang. I deflected it off my glove and it hit me square in the forehead. It went straight up in the air and [Amed] Rosario caught it. I talked them out of [removing me] and stayed in the game. And then two weeks later, I got drilled with another comebacker. It hit me square in the collarbone. And I ended up getting pulled out of that one.
“I wasn’t very aggressive in St. Lucie. After I started getting hit around a little bit, I almost felt like I was getting a little gun-shy, trying to be too perfect. And then I started walking guys. I put myself in bad situations.”
This season has been smooth sailing. Binghamton pitching coach Glenn Abbott harped early on this season on the importance of attacking the bottom portion of the strike zone.
“If I ever get hit, it’s because I’m up -- not because I’m walking guys and falling behind,” Roseboom said. “… With inheriting runners, I’ve really just kind of forgotten about them and not worried about, ‘Oh, that’s the go-ahead and the tying run on second and third with two outs.’ I’m one pitch away from getting them off the field and getting my offense up in the box and swinging the momentum back in our favor. That’s really helped me out a lot -- not reading into the situation and just pitching.”
Roseboom grew up in Pattersonville, New York, which is located about 30 minutes northeast of the capital Albany, in farm country off the Mohawk River. He originally intended to play college baseball at Ole Miss, but staff upheaval with that program after he committed left him searching late for another college home.
Roseboom had to overcome early adversity at USC Upstate, too. He began his college career 0-10. He went undrafted as a junior after pitching through a knee injury and intercostal strain. The Mets then selected him after his senior season two years ago.
Average: T.J. Rivera, Vegas, .340; Brandon Nimmo, Vegas, .336; Tomas Nido, St. Lucie, .322; Amed Rosario, Binghamton, .321; Reed Gamache, Kingsport, .310; Walter Rasquin, Kingsport, .310; Gavin Cecchini, Vegas, .309; Roger Bernadina, Vegas, .298; Travis Taijeron, Vegas, .295; Kevin Taylor, St. Lucie, 294.
Homers: Johnny Monell, Vegas, 18; Travis Taijeron, Vegas, 15; Dilson Herrera, Vegas, 13; Marc Krauss, Vegas, 13; Dominic Smith, Binghamton, 12.
RBIs: Travis Taijeron, Vegas, 75; David Thompson, St. Lucie, 75; Dominic Smith, Binghamton, 73; T.J. Rivera, Vegas, 73; Johnny Monell, Vegas, 59.
Steals: Champ Stuart, Binghamton, 34; Patrick Biondi, St. Lucie, 19; Jacob Zanon, Brooklyn, 18; J.C. Rodriguez, Columbia, 15; Amed Rosario, Binghamton, 14.
ERA: Thomas Szapucki, Brooklyn, 0.44; P.J. Conlon, St. Lucie, 1.87; Harol Gonzalez, Brooklyn, 2.02; Luis Silva, GCL Mets, 2.03; Ricky Knapp, Vegas, 2.45; Luis De Los Santos, GCL Mets, 2.89; Gabriel Llanes, Brooklyn, 3.18; Jake Simon, Kingsport, 3.44; Kevin Canelon, Columbia, 3.48; Erik Manoah, Brooklyn, 3.53.
Saves: Corey Taylor, St. Lucie, 16; Alex Palsha, St. Lucie, 15; Paul Sewald, Vegas, 13; David Roseboom, Binghamton, 8; Akeel Morris, Binghamton, 6; Beck Wheeler, Vegas, 6.
Strikeouts: Joe Shaw, Columbia, 109; Tyler Pill, Binghamton, 104; Chase Ingram, Columbia, 102.
Rafael Montero, who was demoted after posting a 7.20 ERA in 16 starts with Las Vegas, is the reigning Eastern League Pitcher of the Week. In starts against Reading and Portland, Montero allowed two runs on seven hits and three walks while striking out 15 in 13⅓ innings.
Outfield prospect Wuilmer Becerra, the third player acquired from the Blue Jays in the deal for R.A. Dickey, underwent surgery July 20 to remove a cyst from a shoulder capsule.
Rosario, who is on Binghamton’s disabled list with a hamstring injury, is expected to be active within days. He is hitting .354 with 16 RBIs in 99 at-bats since a promotion from St. Lucie.
Brooklyn left-hander Thomas Szapucki struck out 10 in seven innings on Sunday. He became the fifth southpaw in Cyclones history with a double-digit strikeout performance, joining Mike Cox (2001), Evan MacLane (2004), Dario Alvarez (2013) and Kevin Canelon (2015). Szapucki’s 0.44 ERA this season leads all Mets farmhands.
Harol Gonzalez leads the New York-Penn League with 63 strikeouts. The Cyclones have boasted the league’s strikeout king every season since 2012 -- Luis Mateo, Miller Diaz, Marcos Molina and Canelon.
The Mets have done a ton of roster-shuffling in the minors. Among the moves: right-handers Josh Zeid and Mateo were promoted to Las Vegas, Paul Paez rose to Binghamton and knuckleballer Mickey Jannis was demoted to St. Lucie.
“Farm Report” appears on Wednesdays during the regular season.