The Pirates designated Moreta for assignment Tuesday, Jason Mackey of the Pittsburgh Post-Gazette reports.

Moreta turned in a 3.24 ERA and 1.38 WHIP across 16.2 innings with the Pirates in 2025, and he also finished with a 2.43 ERA over 37 frames at Triple-A Indianapolis. Despite his strong performance, he'll lose his place on Pittsburgh's 40-man roster to make room for a wave of prospects, though another club may be interested in claiming Moreta off waivers.

The Pirates designated Holderman for assignment Tuesday, Jason Mackey of the Pittsburgh Post-Gazette reports.

With the Pirates adding six prospects to their 40-man roster in preparation for the Rule 5 Draft, Holderman will end up as one of the casualties necessary to clear space. The 30-year-old righty wasn't quite his usual self in 2025, finishing the year with a 7.01 ERA and 1.95 WHIP across 25.2 innings after entering the season with a 3.58 ERA across his three years in the big leagues. His prior performance may draw some attention from other bullpen-needy teams browsing the waiver wire.

Ellard retired from professional baseball Tuesday.

The 28-year-old Ellard will hang up his cleats after just two seasons in the majors, during which he posted a 3.95 ERA and 1.39 WHIP alongside a 48:31 K:BB across 41 innings with the White Sox.

The Red Sox traded Murphy to the White Sox on Tuesday in exchange for Ronny Hernandez, Bob Nightengale of USA Today reports.

Murphy was effective as a big-league reliever in 2025, finishing the regular season with a 3.12 ERA and 1.18 WHIP across 34.2 innings. The White Sox aren't working with much depth in their bullpen, so the 27-year-old left-hander could see regular work in high-leverage opportunities with his new organization.

Diaz rejected the Mets' one-year, $22.025 million qualifying offer Tuesday, Alden Gonzalez of ESPN.com reports.

Diaz opted out of the two years and $38 million remaining on his contract with the Mets earlier this month, and now he has passed on the qualifying offer. Neither decision was a surprise, as the closer shouldn't have difficulty netting a big multi-year pact this winter. If he leaves the Mets, New York will receive a draft pick as compensation.

The Red Sox designated Winckowski (elbow) for assignment Tuesday, Chris Cotillo of MassLive.com reports.

The move frees up a spot on Boston's 40-man roster. Winckowski made just six appearances for the Red Sox in 2025, as he spent time in the minors and also missed a large chunk of action with a flexor strain. It's unclear what Winckowski's current health status is. The 27-year-old has a career 4.20 ERA and 195:89 K:BB across 242.1 innings.

The Rays acquired Guerrero from the Red Sox on Tuesday in exchange for Tristan Gray.

Guerrero was outrighted off Boston's 40-man roster last week after passing through waivers unclaimed, but now he's on the move to a new organization. The right-hander holds a 2.63 ERA but a 19:16 K:BB across 27.1 frames covering parts of two major-league seasons. Guerrero has a big arm and the Rays will now be tasked with getting him to throw more strikes, which is something they've had success with as an organization with other hurlers.

The Diamondbacks outrighted Montes De Oca (back) to Triple-A Reno on Monday.

The transaction frees up a spot on the Diamondbacks' 40-man roster. Montes De Oca is recovering from surgery to repair a stress fracture in his back and it's not clear when he will be ready to pitch again. The reliever tossed 2.2 scoreless frames in his lone appearance for Arizona in 2025 and held a 4.07 ERA and 26:6 K:BB over 24.1 innings at Triple-A Reno.

Keller is drawing free-agent interest both as a starter and reliever, Joel Sherman of the New York Post reports.

Keller flourished with the Cubs in 2025 in a full-time relief role, collecting a 2.07 ERA, 0.96 WHIP and 75:22 K:BB over 69.2 regular-season innings. He's a good bet to sign somewhere as a high-leverage reliever, but there are also clubs that think the 30-year-old could have success moving back to a starting pitcher role.

The Padres re-signed Hart to a one-year, $1 million contract with a $2.5 million club option for 2027 on Monday, Robert Murray of FanSided.com reports.

The Padres declined Hart's $5 million club option for 2026 earlier this month, but they've now brought him back at a lesser rate. Hart split his time between the majors and minors in 2025, finishing with a 5.86 ERA and 37:13 K:BB over 43 regular-season innings covering six starts and 14 relief outings with the big club. The southpaw will compete for an Opening Day roster spot -- perhaps in a swingman role -- but does have minor-league options remaining.