The SoftBank Hawks of Japan's Nippon Professional Baseball signed Uwasawa to a four-year contract Wednesday, The Mainichi reports.
Uwasawa signed a minor-league deal with the Rays last offseason and made two relief appearances with the Red Sox in May. The righty now returns to his native Japan to continue his professional career.
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Red Sox's Naoyuki Uwasawa: Outrighted to Worcester
Rotowire
Uwasawa cleared waivers and was outrighted to Triple-A Worcester on Saturday, Pete Abraham of The Boston Globe reports.
Uwasawa was designated for assignment Tuesday, and after clearing waivers, he will stick around in the Red Sox organization. The 30-year-old has appeared in two big-league games, allowing one run on two hits across four innings. He's made six starts in 13 appearances at Triple-A this season.
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Red Sox's Naoyuki Uwasawa: Sent to Triple-A
Rotowire
The Red Sox optioned Uwasawa to Triple-A Worcester on Wednesday.
Uwasawa permitted just one earned run across four relief innings during his brief stint with Boston. He'll likely slot back into the starting rotation in Worcester.
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Red Sox's Naoyuki Uwasawa: Demotion coming
Rotowire
The Red Sox will option Uwasawa to Triple-A Worcester on Wednesday, Pete Abraham of The Boston Globe reports.
Uwasawa will be pushed off the big-league roster with Nick Pivetta (elbow) in line to return from the IL on Wednesday. Uwasawa has performed well during his first MLB stint, giving up just one earned run across four innings, though he has not found the same success while in Triple-A. The 30-year-old may still return to Boston later this season if the Red Sox find themselves in need of a fresh arm capable of pitching multiple innings out of the bullpen.
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Red Sox's Naoyuki Uwasawa: Gets call to majors
Rotowire
The Red Sox recalled Uwasawa from Triple-A Worcester on Sunday.
Uwasawa has made a trio of five-inning starts for Worcester since he was optioned to the affiliate after the Red Sox acquired him from the Rays shortly before Opening Day, but the Japanese right-hander looks like he'll be making his MLB debut as a member of Boston's bullpen. He'll tentatively slot in as a multi-inning relief option, but with three members of the Boston rotation currently on the injured list, Uwasawa could eventually get a chance to make some starts if depth arms such as Cooper Criswell, Josh Winckowski and Chase Anderson aren't able to get the job done as fill-ins in the rotation.
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Red Sox's Naoyuki Uwasawa: Added to roster, optioned
Rotowire
The Red Sox selected Uwasawa's contract and optioned him to their spring training complex, Dennis Lin of The Athletic reports.
Uwasawa is now on Boston's 40-man roster after being acquired via trade from the Rays on Wednesday, but he'll remain at extended spring training for now. The righty should eventually join Triple-A Worcester's rotation.
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Rays' Naoyuki Uwasawa: Struggles in first spring outing
Rotowire
Uwasawa struggled with the pitch clock and PitchCom in his first Grapefruit League outing Thursday, Marc Topkin of the Tampa Bay Times reports.
Uwasawa allowed seven runs on eight hits and a walk across two innings against Atlanta. He acknowledged his discomfort during the outing but also noted that he felt his stuff was good enough to get better results. Manager Kevin Cash was also willing to write off the performance, chalking up the results to Uwasawa's adjustment to the majors. He's in camp on a minor-league deal and could operate as a back-end starter or multi-inning reliever if he makes the team.
