Seattle Mariners

Jorge Polanco went 1-for-4 with a home run and an RBI in the Mariners' 5-3 defeat to the Astros.

Fantasy Impact: Despite the solo shot adding some sparkle to his stat line, Polanco's season continues to be a struggle with a mere .183 batting average and a high strikeout rate of 32.3%. His power numbers are modest with five homers, but the lack of consistent contact and on-base skills (.292 wOBA) limits his fantasy appeal. Owners should view Polanco as a risky play, primarily useful in deeper leagues or as a potential matchup-based option, given his current form and underlying metrics.

Emerson Hancock lasted just 3.2 innings, allowing one earned run on five hits and four walks while striking out four in Wednesday's 5-2 loss to the Braves.

Fantasy Impact: This performance underscores a troubling trend for Hancock, whose season ERA now sits at an inflated 4.75, despite a seemingly decent 1.29 WHIP. His inability to pitch deep into games, coupled with a low strikeout rate of 6.82 K/9, limits his fantasy appeal. The high number of walks in this outing also raises concerns about his control, which is critical given his modest strikeout totals. Fantasy managers should view Hancock as a risky play, primarily in deeper leagues or as a streaming option, depending on the matchup.

The Mariners will option Jonatan Clase to Triple-A Tacoma on Monday. (Source: Daniel Kramer on Twitter)

Fantasy Impact: The 21-year-old rookie has struggled since making his major league debut. Clase slashed .222/.250/.259 with three RBI and two stolen bases in nine games. This move will give Clase a chance to reset and see regular at-bats with Tacoma.

Matt Brash was shut down after having a setback with his right elbow injury while playing catch Friday. (Source: Shannon Drayer on Twitter)

Fantasy Impact: Brash will travel to Dallas to get a second opinion on his right elbow. The team is obviously concerned and fantasy managers should expect the team to have Brash’s next steps outlined after his second opinion.

The Mariners have transferred Gregory Santos to the 60-day injured list. (Source: Mariners PR on Twitter)

Fantasy Impact: This move shouldn't impact the timetable for Santos. He is targeting a return in May.

The Mariners called up Leo Rivas from Triple-A Tacoma. (Source: Mariners PR on Twitter)

Fantasy Impact: Rivas has been called up with J.P. Crawford being placed on the injured list. He is not starting on Thursday, but he should see some starts at shortstop while Crawford is sidelined.

The Seattle Mariners signed Luke Barker to a minor league deal. (Source: Jon Morosi on Twitter)

Fantasy Impact: Barker will report to Triple-A Tacoma. He debuted two years ago with the Brewers and missed all of last season after undergoing Tommy John surgery.

The Seattle Mariners have designated right-hander Ty Adcock for assignment. (Source: Ryan Divish on Twitter)

Fantasy Impact: Adcock's DFA was one of numerous moves the Mariners made on Monday as they needed to clear a roster spot for Ty France who came off the paternity list. He posted a 3.45 ERA, albeit with a 5.17 FIP, in 12 games with the Mariners last season.

The Seattle Mariners have optioned utility player Samad Taylor to Triple-A Tacoma. (Source: Ryan Divish on Twitter)

Fantasy Impact: Taylor's demotion was one of a number of roster moves the Mariners made on Monday. Acquired in the offseason from the Royals, Taylor hit just .200 without a homer but with eight steals in 31 appearances for the Royals in 2023.

The Seattle Mariners have placed right-hander Collin Snider on the 15-day injured list due to a left knee contusion. (Source: Ryan Divish on Twitter)

Fantasy Impact: Snider joins fellow reliever Cody Bolton in hitting the injured list on Monday. The righty has allowed two earned runs in three innings to begin the season after posting a 4.87 ERA in 20 appearances for the Royals in 2023.

The Seattle Mariners have placed right-hander Cody Bolton on the 15-day injured list due to a general medical issue. (Source: Ryan Divish on Twitter)

Fantasy Impact: According to Ryan Divish of the Seattle Times, the issue with Bolton is reportedly kidney stones. The 25-year-old owns a 3.00 ERA through six innings and four appearances to begin the season.

The Seattle Mariners have selected right-hander Tyson Miller from Triple-A Tacoma. (Source: Ryan Divish on Twitter)

Fantasy Impact: Miller's promotion was one of a number of roster moves the Mariners made on Monday. The 28-year-old owns a 2.25 ERA through four appearances with Tacoma to begin the season.

The Seattle Mariners have selected right-hander Brett de Geus from Triple-A Tacoma. (Source: Ryan Divish on Twitter)

Fantasy Impact: de Geus' promotion was one of several roster moves by the Mariners on Monday as he looks to appear in the big leagues for the first time since the 2021 season. He has allowed three earned runs in three innings for Tacoma to begin the season.

The Mariners claimed Sammy Peralta off waivers from the White Sox. (Source: Seattle Mariners on Twitter)

Fantasy Impact: Seattle assigned Peralta to Triple-A Tacoma. He was designated for assignment by the White Sox last week.

Ryne Stanek earned the save Monday against the Guardians, working a quick 1-2-3 inning with one strikeout.

Fantasy Impact: It was a cleaner appearance for Stanek after struggling with his command early in his first appearance of the season. Andres Munoz worked the eighth inning against the middle of the order for Cleveland which led to Stanek closing the game out. He should remain in a high leverage role behind Munoz with Matt Brash and Gregory Santos both on the IL.

The Mariners designated Taylor Trammell for assignment. (Source: MLB.com)

Fantasy Impact: Trammell was unable to make the Opening Day roster for Seattle and was out of options. He'll hit the waivers where he could be picked up by another team.

The Seattle Mariners have outrighted reliever Mauricio to Triple-A Tacoma. (Source: Ryan Divish on Twitter)

Fantasy Impact: The Mariners put the right-hander on waivers and have outrighted him to the minors after he cleared. The 27-year-old posted a 4.89 ERA across 30 relief outings between the Giants and Red Sox in the 2023 campaign.

The Mariners have placed Jackson Kowar on the 60-day injured list. (Source: Brandon Gustafson on Twitter)

Fantasy Impact: Kowar discovered the injury after meeting with doctors last week. He'll miss the entire 2024 season.

Ryan Divish of the Seattle Times reports that Mariners prospect Colt Emerson added 20 pounds of muscle this offseason. (Source: Ryan Divish on Twitter)

Fantasy Impact: Seattle drafted Emerson out of high school with the No. 22 pick in the 2023 MLB Draft. He slashed .374/.496/.550 with two home runs in his professional debut last season. Emerson said he’s hitting balls farther and feels more explosive.