Nelson (shoulder) underwent thoracic outlet surgery Monday, Steve Gilbert of MLB.com reports.
Nelson is expected is expected to miss the rest of the season.
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Diamondbacks' Kyle Nelson: Set for TOS surgery
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Nelson (shoulder) will undergo thoracic outlet syndrome surgery, Alex Weiner of ArizonaSports.com reports.
Nelson was moved to the 60-day IL on Tuesday with what the Diamondbacks termed as shoulder inflammation, but after getting checked out by a specialist, the right-hander was recommended for thoracic outlet syndrome surgery. Pitchers typically require at least 12 weeks of recovery time from the surgery, according to MLB.com, so Nelson shouldn't be expected to be an option out of the Arizona bullpen until at least September.
Nelson is receiving additional opinions on his injured left shoulder before the Diamondbacks decide the next steps to take, Theo Mackie of The Arizona Republic reports.
Nelson landed on the injured list nearly a week ago with what was deemed left shoulder inflammation at the time, but it sounds like he might be dealing with something more serious. More information on his status could be available later this week.
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Diamondbacks' Kyle Nelson: Placed on 15-day IL
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Nelson was placed on the 15-day injured list with left shoulder inflammation Tuesday.
Nelson will now be sidelined for at least a couple weeks while tending to inflammation in his pitching elbow, which is never good news for a hurler. The 27-year-old had been going through a rough stretch on the mound, surrendering five earned runs over 1.1 innings in his last three appearances. It's unclear if the left-hander's stretch of poor performances had anything to do with potential arm issues or not, but he'll now at least have an opportunity to mentally reset while on the shelf. In a corresponding move, Arizona recalled right-hander Justin Martinez from Triple-A Reno on Tuesday.
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Diamondbacks' Kyle Nelson: Needed for length
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Nelson allowed one hit and struck out one over two scoreless innings in Monday's 5-2 loss to the Yankees.
Arizona starter Ryne Nelson was chased after five runs allowed in 2.2 innings, and the Diamondbacks got stellar relief beginning with Kyle Nelson's two frames. The lefty reliever has thrown four scoreless innings to open the season.
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Diamondbacks' Kyle Nelson: Returns to action
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Nelson (groin) allowed one walk over a scoreless and hitless inning in Monday's spring game against Oakland.
Nelson was held back for eight days while dealing with a groin injury, but manager Torey Lovullo never deemed the injury serious enough to impact the pitcher's availability for Opening Day. Nelson is expected to fill a middle-relief role for the Diamondbacks, as he's done each of the last two seasons.
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Diamondbacks' Kyle Nelson: Dealing with groin injury
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Diamondbacks manager Torey Lovullo said Wednesday that Nelson will be held out of action for a few days while he tends to a groin injury, Alex Weiner of ArizonaSports.com reports.
Lovullo isn't worried that Nelson might not be ready for Opening Day, so it's safe to consider the left-hander day-to-day. Nelson is slated to handle a middle-relief role for Arizona this season.
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Diamondbacks' Kyle Nelson: Joins roster for NLDS
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Nelson is on Arizona's roster for its NLDS matchup against the Dodgers, Alex Weiner of ArizonaSports.com reports.
Nelson was left off the D-backs' roster in favor of Bryce Jarvis ahead of the NL Wild Card Series against Milwaukee, and the two pitchers will swap places for the NLDS. Nelson gave up six runs over 3.2 innings across his final five appearances in the regular season, so the Diamondbacks will likely limit him to low-leverage outings.
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Diamondbacks' Kyle Nelson: Listed as Sunday's starter
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Nelson is slated to serve as Arizona's opening pitcher for Sunday's season finale against Astros.
The Diamondbacks clinched a playoff berth despite losing Saturday, so Arizona will presumably look to rest its key pitchers in the regular-season finale in advance of the postseason. It's unclear if manager Torey Lovullo plans to use a bulk reliever behind Nelson, or treat the contest as more of a bullpen day. Either way, Nelson is unlikely to work more than inning or two Sunday.
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Diamondbacks' Kyle Nelson: Takes loss
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Nelson (5-3) was charged with the loss against the Dodgers on Wednesday. He allowed two runs on two hits and two walks and did not retire a batter.
A tense pitching duel was decided when Nelson entered a scoreless game with two outs in the bottom of the eighth inning. He's typically been good when finishing off innings, but the left-hander allowed a double, an intentional walk, a walk and then a two-run single to former Diamondback David Peralta. Nelson has been a trusted bullpen piece for much of the season, but he's posted a 6.43 ERA over seven innings since returning from the All-Star break.
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Diamondbacks' Kyle Nelson: Vultures fourth win
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Nelson (4-1) retired all three batters faced, striking out one, and was credited with the win over the Pirates on Saturday.
Nelson bridged the sixth and seventh innings for the Diamondbacks and benefitted from Pavin Smith's two-run home run to earn his fourth win of the season. The left-hander has pitched well in a middle-relief role for a second consecutive season. Nelson sports a 1.50 ERA over 18 innings (21 appearances) after pitching to a 2.19 ERA in 2022.
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Diamondbacks' Kyle Nelson: Unable to get out of jam
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Nelson blew the save Tuesday against the Athletics. He allowed one run on one hit while striking out one over one-third of an inning.
The Diamondbacks threw Nelson into a tough spot Tuesday, having the left-hander step in for Kevin Ginkel with the bases loaded and two outs. On his second pitch, Ryan Noda took Nelson yard for a game-tying grand slam, scoring Brent Rooker, Aledmys Diaz and Carlos Perez to bring the score to 8-8. Although Nelson was able to bounce back and get Ramon Laureano to go down swinging, the damage had already been done and the Athletics would eventually take the game in walk-off fashion in 12 innings.
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Diamondbacks' Kyle Nelson: Can't escape Kelly's jam
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Nelson allowed one hit and struck out two over one scoreless inning in Saturday's 5-3 loss to San Diego.
Nelson was charged with a blown save, but he was presented with the challenge of getting out of starter Merrill Kelly's none-out, bases loaded jam in the sixth inning. After the first two batters he faced struck out, Ha-Seong Kim's single on a ball hit with a .170 XBA found its way to the outfield to plate two runs. Nelson has pitched well out of the bullpen and earned the high-leverage chance. Even when the left-hander was tagged with Thursday's loss, it was due to two unearned runs thanks to a Nick Ahmed error. Nelson has a 0.93 ERA and 1.24 WHIP with 15 strikeouts and three walks over 9.2 innings.
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Diamondbacks' Kyle Nelson: Called up, appears in relief
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The Diamondbacks recalled Nelson from Triple-A Reno prior to Thursday's 8-2 loss to the Dodgers. He struck out two and worked around two hits in a scoreless inning.
The southpaw was in line to begin the season with Arizona's top affiliate, but Joe Mantiply's shoulder injury resulted in Nelson winning a spot in the Opening Day bullpen. The Diamondbacks are expected to deploy him mainly in low-leverage or middle-innings spots while he's up with the big club.
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Diamondbacks' Kyle Nelson: Will be in Arizona bullpen
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Nelson will have the final spot in the Diamondbacks' bullpen to begin the 2023 season, Nick Piecoro of the Arizona Republic reports.
Joe Mantiply is headed for a season-opening stint on the 15-day IL because of shoulder fatigue, and Nelson will essentially fill the vacancy. The 26-year-old left-hander registered a strong 2.19 ERA and 1.08 WHIP over 37 innings for the Diamondbacks in 2022.
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Diamondbacks' Kyle Nelson: Takes loss
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Nelson (2-1) picked up Monday's loss to the Dodgers, allowing three runs one hit, one walk and a hit batsman without retiring a batter.
Nelson came in after starter Ryne Nelson flummoxed the Dodgers over six shutout innings. The reliever Nelson, who had four straight scoreless appearances since coming off the injured list Sept. 1, left with none out and bases loaded. The lefty reliever has a 2.19 ERA, 30 strikeouts, 14 walks and 11 holds through 37 innings.
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Diamondbacks' Kyle Nelson: Picks up hold
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Nelson hit a batter and retired three over a scoreless eighth inning to earn a hold in Sunday's 5-1 win over Milwaukee.
After Zac Gallen's seven shutout innings, Nelson came on to protect a 3-0 lead, his first setup opportunity since being activated off the injured list. The left-hander walked three in his first outing off the IL, and this one didn't start any better when he hit Victor Caratini, but Nelson retired the next three batters to preserve the lead. Nelson will be part of the late-game crew, called to throw in setup or high-leverage situations. He's been a surprising find for the Diamondbacks, posting a 1.51 ERA (3.08 FIP) after pitching himself out of the Guardians' organization.
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Diamondbacks' Kyle Nelson: Back from IL
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Nelson (back) was reinstated from the 15-day injured list Thursday.
Nelson has been out for the past month due to back spasms, but he'll rejoin the Diamondbacks on Thursday after making one rehab appearance with Triple-A Reno. The 26-year-old has eight holds with a 1.57 ERA, 0.90 WHIP and 27:8 K:BB across 34.1 innings this year and should re-enter the high-leverage mix now that he's healthy.
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Diamondbacks' Kyle Nelson: Throws again Monday
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Nelson (back) threw in a game setting at Arizona's training facility and appears to be on the verge of returning from the injured list, Nick Piecoro of the Arizona Republic reports.
The Diamondbacks will evaluate Nelson's response to the session Tuesday and get him back "as quickly as possible," per manager Torey Lovullo.
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Diamondbacks' Kyle Nelson: Lands on injured list
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Nelson was placed on the 15-day injured list Monday, retroactive to Aug. 5, with lower back spasms.
Nelson has been outstanding out of Arizona's bullpen this season, posting a 1.57 ERA and 0.90 WHIP over 34.1 innings, but the club will be without one of its most reliable relievers for at least the next couple weeks. Edwin Uceta was recalled from Triple-A Reno to take Nelson's place on the roster.
