The Blue Jays signed Mantiply to a minor-league contract Sunday.
Mantiply was an All-Star in 2022, but he's struggled since then, collecting a 5.23 ERA during his time at the big-league level. The southpaw will report to Triple-A Buffalo, where he will provide experienced relief depth.
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Joe Mantiply: Becomes free agent
Rotowire
The Diamondbacks released Mantiply on Sunday.
Mantiply passed through waivers unclaimed after being removed from Arizona's 40-man roster and is now free to seek a gig in a new organization. The left-handed reliever has been torched for 17 runs on 26 hits and three walks over 9.2 innings at the big-league level in 2025.
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Diamondbacks' Joe Mantiply: DFA'd by Snakes
Rotowire
The Diamondbacks designated Mantiply for assignment Friday.
The move makes room on the Diamondbacks' roster for Jeff Brigham, whose contract was selected by Arizona from Triple-A Reno. Mantiply was sent down to Triple-A on May 15 after posting a 15.83 ERA and 3.00 WHIP across 9.2 major-league innings. He hasn't fared that much better in Triple-A with a 5.56 ERA and 1.53 WHIP in 11.1 innings.
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Diamondbacks' Joe Mantiply: Shuttled back to minors
Rotowire
Mantiply was optioned to Triple-A Reno on Thursday, Alex D'Agostino of SI.com reports.
Mantiply has struggled mightily in the majors this season, allowing multiple earned runs in half of his 10 appearances. He'll head back to Reno for the second time and seek to regain the solid form he's showcased for the last few campaigns.
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Diamondbacks' Joe Mantiply: Back in Arizona
Rotowire
The Diamondbacks recalled Mantiply from Triple-A Reno on Saturday.
Mantiply has given up 13 runs in only 7.1 innings with the D-backs this season, but he's only allowed two runs in six frames since being sent down to Triple-A. He'll get another look in the majors as a replacement for Cristian Mena, though it's unlikely Arizona uses Mantiply outside of low-leverage situations.
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Diamondbacks' Joe Mantiply: Sent down to Reno
Rotowire
The Diamondbacks optioned Mantiply to Triple-A Reno on Saturday.
Mantiply has struggled mightily in the big leagues this season, giving up 13 earned runs in just 7.1 innings. He'll attempt to get back on track in Triple-A, though the D-backs may want to see him sustain success for an extended period of time before inserting him back into their bullpen.
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Diamondbacks' Joe Mantiply: ERA on rise
Rotowire
Mantiply allowed two runs on four hits and one walk while striking out one over one inning in Tuesday's 10-4 win over the Marlins.
The Diamondbacks were leading, 10-1, when Mantiply opened the seventh inning, so the scoring allowed didn't jeopardize the club, but the left-hander hasn't executed thus far. He isn't overpowering, so he needs to be precise with location. Mantiply's given up runs in his last three outings, pushing his ERA to 13.50 over 6.2 innings (seven outings).
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Diamondbacks' Joe Mantiply: Set to open Monday's game
Rotowire
Manager Torey Lovullo said Mantiply will serve as the Diamondbacks' opening pitcher for Monday's game against the Dodgers, Nick Piecoro of The Arizona Republic reports.
The left-handed Mantiply has limited opposing lefties to a .275 wOBA over his career, so the Diamondbacks will likely hope that he can limit the damage from the Dodgers' usual Nos. 2 and 3 hitters -- left-handed batters Shohei Ohtani and Freddie Freeman -- before he turns the game over to the bullpen. Monday had been Slade Cecconi's turn in the rotation, and the expectation is that he'll work behind Mantiply in bulk relief.
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Diamondbacks' Joe Mantiply: Tosses scoreless inning
Rotowire
Mantiply allowed a walk over a scoreless inning in Friday's 6-5 extra-inning loss to Atlanta.
Mantiply's effort spanned the seventh and eighth innings and was his third straight scoreless outing after he ceded a pair of runs in his regular-season debut. The lefty could be used at any time in a game and is one of two southpaws in the bullpen.
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Diamondbacks' Joe Mantiply: Makes spring debut
Rotowire
Mantiply allowed one hit and hit two batters over a scoreless inning in Friday's spring game against Cincinnati.
Mantiply loaded the bases with one out but wriggled out of the jam by inducing a 5-2-3 double play. That he faced adversity and pitched out it is the positive spin on the left-hander's first Cactus League appearance. He's expected to occupy a spot in the bullpen to open the season, but the one-time high-leverage option needs better results to reclaim a trusted role in 2024. Mantiply recorded a 4.62 ERA with a diminished strikeout rate and increased walk rate in 2023.
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Diamondbacks' Joe Mantiply: To open Game 4
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Mantiply will work as the opener for Game 4 of the World Series against the Rangers on Tuesday, Jeff Passan of ESPN.com reports.
Mantiply last pitched during Game 1, striking out one batter over a scoreless inning of relief work. He figures to work the first inning or so before handing the ball to a primary pitcher. The Diamondbacks have yet to reveal any pitching plans past Mantiply, but Ryne Nelson would figure to be one of the top candidates to get outs, as he's yet to take the mound this series.
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Diamondbacks' Joe Mantiply: Serving as opener Monday
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Mantiply is scheduled to work as the Diamondbacks' opening pitcher for Monday's game against the Rangers, Jody Jackson of Bally Sports Arizona reports.
Mantiply hasn't tossed more than three innings in any of his 31 appearances in the majors or minors this season and hasn't exceeded two innings in more than two months, so he's unlikely to work more than once through the Texas batting order before exiting the contest. Slade Cecconi, who had initially been listed as Arizona's scheduled starter for Monday, will most likely work in bulk relief behind Mantiply.
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Diamondbacks' Joe Mantiply: Opening Tuesday's contest
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Mantiply will serve as the Diamondbacks' opening pitcher for Tuesday's game in Colorado, Jody Jackson of Bally Sports Arizona reports.
After taking the loss in relief in Monday's series opener at Coors Field while failing to retire any of the three batters he faced en route to allowing three earned runs, Mantiply will get back on the hill Tuesday and attempt to right the ship. He tossed only 11 pitches Monday, so Mantiply should be able to give Arizona an inning or two before turning the game over to the bullpen. Arizona hasn't named a designated bulk reliever for the day, but manager Torey Lovullo could lean heavily on either Slade Cecconi or Bryce Jarvis, both of whom have started in the minors for most of the season and are available on three days' rest.
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Diamondbacks' Joe Mantiply: Recalled from Reno
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The Diamondbacks recalled Mantiply from Triple-A Reno on Tuesday, Alex Weiner of ArizonaSports.com reports.
Mantiply has taken a major step back this season, accumulating a 5.74 ERA and 1.09 WHIP through 15.2 innings in the majors this season (2.85 ERA in 2022). He hasn't fared well in Triple-A either, but he'll still be called upon to provide Arizona's bullpen with a fresh arm. Peter Strzelecki, who was acquired in a trade with the Brewers on Tuesday, was optioned in a corresponding move.
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Diamondbacks' Joe Mantiply: Sent down to Triple-A
Rotowire
Mantiply was optioned to Triple-A Reno on Friday.
Mantiply was up for a few days while Andrew Chafin was on paternity leave but now heads back to Reno with Chafin back in the fold. The 2022 All-Star has had a tougher time in 2023 with a 5.74 ERA in 13 appearances.
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Diamondbacks' Joe Mantiply: Dispatched to Triple-A
Rotowire
The Diamondbacks optioned Mantiply to Triple-A Reno on Monday.
The 2022 All-Star's move to the minors comes after he surrendered eight earned runs over eight innings across his five relief appearances since Arizona reinstated him from the 15-day injured list June 12. The Diamondbacks haven't announced a corresponding roster move for Mantiply, who could be back in the Arizona bullpen after stringing together a few quality appearances at Triple-A.
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Diamondbacks' Joe Mantiply: Comes back from IL
Rotowire
The Diamondbacks reinstated Mantiply (hamstring) from the 15-day injured list Monday.
The 2022 All-Star will rejoin the Arizona bullpen after he had been on the shelf for just over a month with a right hamstring strain. Maniply received the green light to return from the IL after making a pair of minor-league rehab appearances last week.
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Diamondbacks' Joe Mantiply: Placed on 15-day IL
Rotowire
Arizona placed Mantiply on the 15-day injured list Friday, retroactive to May 9, with a right hamstring strain.
Anthony Misiewicz has been called up from Triple-A Reno to handle a lefty relief role. The 32-year-old Mantiply was sporting a sharp 2.35 ERA with eight strikeouts and zero walks through 7.2 innings this season. He's expected to be out 3-4 weeks.
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Diamondbacks' Joe Mantiply: Makes season debut
Rotowire
Mantiply allowed one run on one hit while striking out one over 1.1 innings in Tuesday's 8-7 win over the Cardinals.
Mantiply was activated off the injured list earlier in the day and made his season debut in what was low-leverage spot -- the Diamondbacks were leading, 7-3, at the time. The lefty later gave up a home run to Willson Contreras. Mantiply has been very good at keeping balls in the park since joining Arizona, giving up just seven homers over 102 innings (0.7 HR/9) entering the 2023 season. He was an All Star in 2022 and is expected to be part of the trusted, high-leverage relief crew.
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Diamondbacks' Joe Mantiply: Might have short rehab assignment
Rotowire
Diamondbacks manager Torey Lovullo said Tuesday that Mantiply (shoulder) might only need one rehab appearance, Theo Mackie of The Arizona Republic reports.
Mantiply is scheduled to make his first rehab appearance Wednesday with Double-A Amarillo, and it sounds like it could also be his last. The 32-year-old reliever began the 2023 season on the 15-day injured list after battling left shoulder fatigue toward the end of spring training, but he's been throwing without issue for a couple of weeks.
