The Athletics signed Soderstrom to a seven-year, $86 million contract extension Thursday, Jeff Passan of ESPN.com reports. The deal includes a club option for 2033.

The deal buys out at least three free-agent years and can max out at $131 million if Soderstrom reaches all of the escalators in the contract. Soderstrom broke out in 2025 in his first full major-league season, slashing .276/.346/.474 with 25 home runs and 93 RBI. He also learned to play left field on the fly and took to it surprisingly well, finishing as a Gold Glove finalist. Soderstrom will be only 31 in the final year of the contract if the Athletics pick up his option, so it's a deal that is likely to be very team-friendly if he continues his upward trajectory.

The White Sox designated Rolison for assignment Tuesday.

The transaction frees up a spot on the 40-man roster for Sean Newcomb, who was signed Tuesday. Rolison was a waiver claim of the White Sox earlier this month and will now be up for grabs on waivers again. He held a 7.02 ERA and 25:20 K:BB over 42.1 innings with the Rockies in 2025.

The White Sox signed Newcomb (elbow) to a one-year, $4.5 million contract Tuesday.

Newcomb was terrific as a full-time reliever after being traded to the Athletics last season, collecting a 1.75 ERA and 50:14 K:BB over 51.1 innings. The left-hander will get an opportunity to start in Chicago, per Will Sammon of The Athletic, though he could eventually shift back to a relief role. Newcomb's 2025 campaign ended prematurely due to left elbow inflammation, but he should be ready to go for spring training.

Young is expected to see the majority of playing time at second base for the Mariners in 2026 even if the team acquires a second baseman from outside the organization, Ken Rosenthal and Will Sammon of The Athletic report.

The Mariners remain very high on Young even after he had just a .607 OPS in 257 plate appearances during his rookie season. Young is just 22, but the Mariners appear committed to giving him some leash in the majors in 2026. It seemingly makes a trade for Ketel Marte unlikely, and if Brendan Donovan is acquired, he would be in line to see the bulk of his reps at a position other than second base.

The Mariners signed Refsnyder to a one-year, $6.25 million contract Monday, Chris Cotillo of MassLive.com reports.

Refsnyder slashed a robust .312/.407/.516 versus left-handed pitching during his four seasons with the Red Sox, and it should be against southpaws that he sees most of his playing time with the Mariners. He's capable of handling all three outfield spots, and while Refsnyder does have past infield experience, he hasn't played on the dirt regularly since 2017.

The Athletics designated Waldichuk for assignment Monday.

The move frees up a spot on the 40-man roster for the addition of Jeff McNeil (shoulder), who was acquired via trade. Waldichuk missed all of 2024 and the first half of 2025 while recovering from Tommy John surgery, and he posted an 8.65 ERA, 2.06 WHIP and 64:42 K:BB across 51 innings this past season at Triple-A Las Vegas. The lefty will turn 28 in January and hasn't pitched in the majors since 2023, but with a career 33.9 percent strikeout rate in the minors and team control through 2029, he could draw interest via trade or waivers.

The Athletics acquired McNeil (shoulder) and cash considerations from the Mets on Monday in exchange for Yordan Rodriguez, Jeff Passan of ESPN.com reports.

McNeil finished the 2025 season with a .243/.335/.411 batting line and 12 home runs over 462 plate appearances, which was his best offensive season since he made the All-Star team and won the National League batting title in 2022. He underwent thoracic outlet surgery after this past season but is expected to be ready for spring training. Slated to turn 34 just after Opening Day, McNeil will take over as the Athletics' starting second baseman and will get a boost with a move from Citi Field to Sutter Health Park.

The Tigers re-signed Mattison to a minor-league contract Dec. 18 that includes an invitation to spring training, Evan Petzold of the Detroit Free Press reports.

Mattison was non-tendered by the Tigers last month, but he's now back in the organization and will be in big-league camp this spring. The righty reliever boasts a 32.8 percent strikeout rate in the minors but has been held back by a bloated 13.4 percent walk rate.

The White Sox signed Harris to a minor-league contract Monday that includes an invitation to spring training, James Fegan of SoxMachine.com reports.

Harris hit .285/.369/.435 at Triple-A Round Rock in the Rangers organization last season but went just 8-for-40 with a 30.2 percent strikeout rate during his time with the big club. The White Sox don't have much outfield depth, so the 26-year-old Harris has an outside shot of pushing for an Opening Day roster spot.

The Guardians signed Heuer to a minor-league contract Monday that includes an invitation to spring training, Tim Stebbins of MLB.com reports.

Heuer got into three games between the Rangers and Tigers in 2025 but spent most of the season at the Triple-A level, where he held a 3.14 ERA and 62:17 K:BB over 48.2 innings. The 29-year-old reliever will compete for a spot in the Guardians' bullpen but is likely headed to Triple-A Columbus to begin next season.