The Diamondbacks released Castro on Wednesday.
Castro went unclaimed after Arizona sent him to waivers, and now he's officially a free agent. The veteran reliever missed significant time with a shoulder injury this season and when healthy posted a 5.93 ERA and 8:3 K:BB over 13.2 innings. However, Castro's solid track record should earn him another look somewhere, likely on a minor-league contract.
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Diamondbacks' Miguel Castro: Dropped from 40-man roster
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Castro was designated for assignment by the Diamondbacks on Tuesday, Alex Weiner of ArizonaSports.com reports.
Castro appears to be the odd man out in the bullpen after Arizona acquired right-hander Dylan Floro from the Nationals on Tuesday. Castro will now be placed on waivers, and if he goes unclaimed, he'll either report to Triple-A Reno or elect free agency.
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Diamondbacks' Miguel Castro: Throws scoreless inning
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Castro allowed one hit and struck out one over a scoreless inning in Saturday's 12-1 win over the Blue Jays.
Castro made his first appearance since being activated off the injured list Thursday. He pitched a scoreless eighth inning with the Diamondbacks ahead 8-1. Castro had missed nearly three months with shoulder inflammation.
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Diamondbacks' Miguel Castro: Returns to Arizona
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The Diamondbacks reinstated Castro (shoulder) from the 15-day injured list Thursday.
Castro pitched two innings in his final rehab appearance Saturday and gave up no runs on one hit with a walk and a strikeout. The right-hander is now set to make his return after he landed on the injured list due to right shoulder inflammation in late April. In a corresponding move, Slade Cecconi was optioned to Triple-A Reno.
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Diamondbacks' Miguel Castro: Another rehab appearance
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Castro (shoulder) threw 17 pitches in an appearance with Triple-A Reno on Wednesday, Jesse Friedman of GoPHNX.com reports.
Castro will make another appearance Saturday, with the goal of throwing between 25 and 35 pitches. If that outing goes well, he could be activated for the start of Arizona's series against Atlanta on Monday.
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Diamondbacks' Miguel Castro: In midst of rehab assignment
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Castro (shoulder) made his second rehab appearance in the rookie-level Arizona Complex League on Saturday, striking out four and allowing one hit and no walks over two scoreless innings.
Castro was placed on the Diamondbacks' 15-day injured list April 23 with right shoulder inflammation but looks to be closing in on a return after turning in a pair of scoreless appearances in the ACL. According to MLB.com, manager Torey Lovullo previously said that the Diamondbacks are targeting this upcoming Wednesday for Castro's return from the IL, but that date could be pushed back if the organization first wants him to get in some work with a higher-level affiliate.
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Diamondbacks' Miguel Castro: Throws another bullpen
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Castro (shoulder) threw a 26-pitch bullpen session Friday, Jesse Friedman of GoPHNX.com reports.
Castro continued to ramp up after tossing 21 pitches in his previous bullpen session Tuesday. The 29-year-old should begin a rehab assignment soon.
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Diamondbacks' Miguel Castro: Throws bullpen session
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Castro (shoulder) threw a 21-pitch bullpen session Tuesday, Alex Weiner of Arizona Sports reports.
He will throw another bullpen session Friday. Castro has been shelved since late April with right shoulder inflammation but would appear to be trending toward a rehab assignment sooner rather than later.
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Diamondbacks' Miguel Castro: Throws without issues Friday
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Castro (shoulder) threw on flat ground Friday and said he felt good, Jesse Friedman of GoPHNX.com reports.
Castro was shut down from his throwing program May 19 after feeling discomfort at the top of his shoulder, but he's resumed his throwing program. Prior to the setback, Castro had stretched out to 120 feet. The Diamondbacks will likely play it safe with Castro moving forward.
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Diamondbacks' Miguel Castro: Set to start throwing program
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Diamondbacks manager Torey Lovullo said Monday that Castro (shoulder) will begin his throwing program this week, Theo Mackie of The Arizona Republic reports.
Castro landed on the 15-day injured list Tuesday -- retroactive to April 21 -- due to right shoulder inflammation. He posted a 5.19 ERA and 1.50 WHIP over 8.2 innings prior to being placed on IL. The 29-year-old right-hander is eligible to be activated May 6, but he could stay on the IL past that date depending on how he progresses in his throwing program.
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Diamondbacks' Miguel Castro: To IL with shoulder injury
Rotowire
The Diamondbacks placed Castro on the 15-day injured list Tuesday, retroactive to April 21, with right shoulder inflammation.
Castro will undergo an MRI on his right shoulder Wednesday, Theo Mackie of The Arizona Republic reports. The reliever was dealing with discomfort for a bit, but it seems to have gradually gotten worse. He surrendered two runs on four hits across one inning during his last appearance Saturday. The 29-year-old is eligible for activation May 6, a team off day before the start of a series against the Reds. In a corresponding move, Andrew Saalfrank was recalled from Triple-A Reno.
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Diamondbacks' Miguel Castro: Allows eighth-inning run
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Castro allowed one run on two hits over one-third of an inning in Friday's 6-5 extra-inning loss to Atlanta.
Castro, who entered with one out in the eighth inning and a string of righties due up, gave up a pair of doubles that started Atlanta's comeback from a 5-2 deficit. Kevin Ginkel could not hold the lead in the ninth, as the Diamondbacks didn't execute well -- pitching or fielding -- at the end of the game. The right-handed Castro is part of the setup crew and will get high-leverage appearances.
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Diamondbacks' Miguel Castro: More runs allowed Thursday
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Castro allowed one run on two hits while striking out two over 1.1 innings in Thursday's spring game against Kansas City.
Castro has allowed runs in five consecutive appearances and owns an 11.12 ERA through 5.2 Cactus League innings. There was a one-month stretch from mid-May to mid-June in 2023 when Castro was closing games and regularly pitching high-leverage situations, but things fell apart quickly. Despite the poor spring results, Castro is expected to be part of the Opening Day bullpen.
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Diamondbacks' Miguel Castro: Placed on paternity leave
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The Diamondbacks placed Castro on the paternity list Friday.
Castro appears likely to miss the Diamondbacks' entire three-game weekend series at Yankee Stadium as he welcomes a new addition to his growing family. Slade Cecconi has been recalled from Triple-A Reno in a corresponding roster move.
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Diamondbacks' Miguel Castro: Spoils Pfaadt's outing
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Castro (5-6) was credited with Friday's loss to San Diego. He allowed four runs on three hits over a third of an inning.
Castro entered a scoreless tie after Brandon Pfaadt fired seven scoreless innings of one-hit ball. He hit a batter with his first pitch then allowed a pair of singles and left following Fernando Tatis' home run made it 4-0. It was the second straight contest in which Castro has allowed four runs.
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Diamondbacks' Miguel Castro: Blows lead, takes loss
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Castro (5-4) was tagged with Thursday's loss to Atlanta. He allowed three runs on two hits and one walk over two-thirds of an inning.
Castro, who began the eighth inning protecting a 5-3 lead, sandwiched a pair of outs around a double before getting into trouble. He walked Ozzie Albies before Austin Riley took him deep for a three-run home run. Although Castro's 3.4 BB/9 is an improvement over previous seasons, it's still a high number and the right-hander walked a delicate line before Thursday's costly free pass. A one-time part of the closer picture, Castro has since returned to a middle-relief role, one in which he's had recent success. Castro entered the game with a 1.50 ERA over his previous 12 innings.
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Diamondbacks' Miguel Castro: Records seventh save
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Castro picked up the save in Monday's 9-8 win over the Phillies. He allowed one run on two hits and no walks while striking out one over one inning.
Castro's seventh save of the season wasn't particularly smooth, but the Diamondbacks' two-run lead heading into the ninth inning provided him just enough cushion. The right-hander has had a shaky start to June, giving up six runs across three innings. With the Diamondbacks still taking a closer-by-committee approach at the back end of their bullpen, fantasy managers can't count on Castro continuing to get consistent save opportunities if he keeps giving up runs.
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Diamondbacks' Miguel Castro: Stumbles in ninth inning
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Castro (3-2) allowed four runs on two hits and two walks Sunday. He recorded two outs (one strikeout) while blowing a save chance and taking the loss against Atlanta.
Castro entered the ninth inning with a one-run lead and coughed up a go-ahead grand slam. He was riding a 10.1-inning scoreless streak since May 7 when he gave up a homer and blew a save against Washington. The 28-year-old's ERA spiked to 3.46 with a 23:10 K:BB through 26 frames.
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Diamondbacks' Miguel Castro: Earns fifth save
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Castro allowed one hit in a scoreless ninth inning against Boston on Sunday. He struck out two and picked up a save.
Castro coughed up a single but still closed out the 4-2 win with ease. He's converted five of his six save chances this season, including four straight dating back to May 12. During that span, Castro has fired 8.1 shutout frames, lowering his season ERA to 2.22 with a 22:8 K:BB.
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Diamondbacks' Miguel Castro: Unavailable for save
Rotowire
Castro was not used for a save opportunity in Wednesday's 6-5 extra-inning loss to Philadelphia.
None of Arizona's most trusted bullpen arms were available due to heavy usage this week. Castro had pitched three of the last four days, as had Andrew Chafin and Kyle Nelson. With a 5-3 lead entering the ninth inning, manager Torey Lovullo tried to get by with Jose Ruiz, but he allowed a two-run home run with two outs that sent the game into an extra frame.
