Sheffield was one of the team's best pitchers before spring training was suspended, Brandon Gustafson of 710 ESPN Seattle reports.

Sheffield, who recorded five strikeouts across three innings in his third Cactus League start versus the Giants on Sunday, deployed a two-seam fastball with considerable success during the outing, Daniel Kramer of MLB.com reports. "Honestly, from pitch one today, beginning in his bullpen, that was the best I ever caught from [Sheffield]," catcher Tom Murphy said. "He threw his two-seamer exclusively. That was something he wanted to do. He put it on himself. It was the most natural that I've seen his fastball move."

Sheffield allowed an earned run on two hits across three innings in a Cactus League loss to the Rockies on Monday. He struck out four.

Sheffield fired two perfect innings during which he recorded three strikeouts in a Cactus League win over the Brewers on Tuesday.

Sheffield gave up one run on five hits and four walks while striking out two over five innings in a no-decision against the A's on Friday night.

Sheffield allowed four earned runs on five hits and one walk while striking out five across 4.1 innings Saturday against the Orioles. He did not factor into the decision.

Sheffield is slated to get two more starts before the conclusion of the regular season, Greg Johns of MLB.com reports.

Sheffield allowed six runs (five earned) on six hits and a walk over 4.1 innings Sunday, striking out eight in the win over the White Sox. He didn't factor into the decision.

Sheffield did not factor into the decision against Cincinnati on Tuesday, pitching six innings and giving up one run on seven hits and three walks while striking out four.

Sheffield will make his next start Tuesday against the Reds, Greg Johns of MLB.com reports.

Sheffield will likely have his next start pushed back, Shannon Drayer of 710 ESPN Seattle reports.

Sheffield gave up no runs on five hits and two walks while striking out seven through five innings in a no-decision against the Cubs on Monday.

Sheffield (0-1) allowed five runs on six hits with no walks and five strikeouts across 4.1 innings while taking a loss against the Yankees on Wednesday.

Sheffield will stick in Seattle's rotation and make his next start Wednesday versus the Yankees, Greg Johns of MLB.com reports.

Sheffield allowed three runs on seven hits and three walks Friday, striking out three over four innings. He did not factor in the decision as the Mariners won 7-4 over the Blue Jays.

Sheffield was recalled from Double-A Arkansas to start Friday against the Blue Jays.

Sheffield is expected to be recalled from Double-A Arkansas to start Friday's game against the Blue Jays, Shannon Drayer of 710 ESPN Seattle reports.

Sheffield, who's been considered a candidate for a promotion from Double-A Arkansas to start this Saturday against the Blue Jays, is more likely to be called up toward the end of August, Ryan Divish of The Seattle Times reports.

Sheffield is a candidate to be called up from Double-A Arkansas to start Saturday against the Blue Jays, Greg Johns of MLB.com reports.

Sheffield is a candidate to be called up and fill in the rotation spot left open by the trade of Mike Leake on Wednesday, Ryan Divish of The Seattle Times reports.

Sheffield, who is 1-2 with a 4.38 ERA across seven starts for Triple-A Tacoma, is not expected to be promoted to fill the rotation spot that opened up when Erik Swanson was optioned to the Rainiers, Greg Johns of MLB.com reports. "I think when we get to the point where we call Justus up, we'd like to call him up and leave him here and let him go," manager Scott Servais said. "I don't want to call him up and give him one or two outings and then go back and forth. He's working on things right now."

Sheffield picked up his first victory of the season in Triple-A Tacoma's win over Albuquerque on Monday, allowing an earned run on four hits and three walks across 5.1 innings while recording five strikeouts.

Sheffield was optioned to Triple-A Tacoma on Saturday.

Sheffield served as the long reliever behind Yusei Kikuchi in an extra-innings win over the Rangers on Friday, allowing two earned runs on two hits and four walks over three innings. He struck out three.

Sheffield was officially promoted for his Mariners' debut Friday.

Sheffield will be called up from Triple-A Tacoma to serve as the primary pitcher behind Yusei Kikuchi in Friday's game against the Rangers, Ryan Divish of The Seattle Times reports.

Sheffield, who's 0-1 with a 5.19 ERA through two starts at Triple-A Tacoma, is a candidate to be called up if Wade LeBlanc (oblique) is forced to miss at least one start, Greg Johns of MLB.com reports.

Sheffield was optioned to Triple-A Tacoma on Monday, Shannon Drayer of 710 ESPN Seattle reports.

Sheffield fired 3.2 scoreless innings in an afternoon intrasquad game Thursday during which he faced Dee Gordon, Mitch Haniger (back), Edwin Encarnacion and Ichiro Suzuki, Greg Johns of MLB.com reports.

Sheffield (finger) is slated to follow starter Wade LeBlanc in the Mariners' pitching schedule during Sunday's Cactus League game versus the Padres, Ryan Divish of The Seattle Times reports.

Sheffield will have his Cactus League debut bumped back a day or two due to a finger blister on his left hand, Greg Johns of MLB.com reports.

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.New York Yankees pitching prospect Justus Sheffield was traded to the Seattle Mariners on Monday night as part of the deal for James Paxton. Sheffield was the Yankees top prospect. Centerfielder Dom Thompson-Williams and starting pitcher Erik Swanson were also part of the deal. Sheffield is a lefty capable of hitting the mid-90s with his fastball and can facilitate strikeouts with his slider. He produced a 6-4 record with a 2.56 ERA and 84/36 K/BB ratio at Triple-A Scranton in 2018. This move increases Sheffield's stock in dynasty formats as he will likely move into the Mariners' starting rotation during the first half of the 2019 season.

Sheffield was traded to the Mariners along with Dom Thompson-Williams and Erik Swanson in exchange for James Paxton, Ryan Divish of The Seattle Times reports.

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.With the New York Yankees in command Wednesday night in the Bronx, manager Aaron Boone opted to call Justus Sheffield into the game. The 22-year-old, currently the highest-rated prospect in the New York Yankees organization, debuted against the archrival Boston Red Sox. Although his club held a nine-run lead, Sheffield clearly had some jitters, walking a batter and allowing two hits. Eventually, however, he would escape with a game-ending double play, showing some emotion as the game came to a close. Sheffield was groomed down the stretch of the minor league season to become a reliever in anticipation of his Yankees debut.

The Yankees officially selected Sheffield's contract from Triple-A Scranton/Wilkes-Barre on Tuesday.

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.New York Yankees starting pitcher prospect Justus Sheffield was called up to the big leagues on Saturday. The No. 16 overall prospect in baseball, per Keith Law, was previously dominating at Triple-A Scranton/Wilkes-Barre. The first-round pick will be used out of the bullpen, however, which means he won't have value in redraft leagues. Sheffield should be owned in all dynasty/keeper formats. In 25 outings with Double-A and Triple-A, Sheffield was 7-6 with a 2.48 ERA and 123 strikeouts. Opponents hit just .195 against him in the minors.

Sheffield's contract was selected by the Yankees on Saturday, Conor Foley of The Scranton Times-Tribune reports.

Sheffield may not join the Yankees as a September callup, Pete Caldera of The Bergen Record reports.

Sheffield was moved to the bullpen Friday in preparation for his September callup by the Yankees, Jack Curry of YES Network reports.

General manager Brian Cashman said Wednesday that Sheffield will pitch in some capacity for the Yankees this year, Brendan Kuty of NJ.com reports.

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New York Yankees pitching prospect Justus Sheffield is expected to join the major league team this season, according to general manager Brian Cashman. "You'll see him here pitching for New York -- whether it's as a rotation guy or out of the bullpen at some point, I would expect in 2018," Cashman said to WFAN Sports Radio on Wednesday. Sheffield is the Yankees' highly-touted pitching prospect, and a youngster they see as a top-of-the-rotation starter in the future. He's currently 5-3 with a 2.16 ERA in 15 Triple-A games. Dynasty owners can relish in the fact that Sheffield will get some major league action this year.

Sheffield has a 1.71 ERA, 1.08 WHIP and 51:18 K:BB in 52.2 innings over his last 10 starts for Triple-A Scranton/Wilkes-Barre.

Sheffield (shoulder) was taken off the disabled list ahead of Wednesday's start against Triple-A Pawtucket, DJ Eberle of the Times Leader News reports.

Sheffield (shoulder) will take the hill against Triple-A Pawtucket on Wednesday, DJ Eberle of the Times Leader reports.

Sheffield (shoulder) was placed on the 7-day disabled list Saturday, Brendan Kuty of NJ.com reports.

Sheffield exited Friday's game at Triple-A Scranton/Wilkes-Barre with shoulder tightness, Conor Foley of The Scranton Times-Tribune reports.

Sheffield was promoted to Triple-A Scranton/Wilkes-Barre on Thursday, Bryan Hoch of MLB.com reports.

Sheffield threw six shutout innings and struck out nine for Double-A Trenton in its 6-1 victory over Portland on Tuesday. He gave up three hits and three walks in the outing.

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New York Yankees pitching prospect Justus Sheffield went six innings allowing two runs and striking out eight batters Thursday night for Double-A Trenton. The left-hander is now 1-1 with a 3.38 ERA over his first three starts. Sheffield has 22 strikeouts in 16 innings, but has been hurt with ten walks. Sheffield has strong upside and if he can straighten out his control, he has a chance to make his major league debut this year.

Sheffield was reassigned to minor league camp Thursday, Lindsey Adler of The Athletic New York reports.