The Mariners optioned Diaz to their spring training complex Monday.

The move makes room on the Mariners' 28-man active roster for right-handed reliever Gregory Santos (biceps), who was reinstated from the 15-day injured list. Diaz had made two appearances for the big club since being recalled Sept. 1, allowing one hit and one walk while striking out three over 3.1 scoreless innings.

The Mariners reinstated Santos (biceps) from the 15-day injured list Monday, Daniel Kramer of MLB.com reports.

Santos had been on the injured list since Aug. 2 due to right biceps inflammation. He began his rehab assignment with Triple-A Tacoma in early September, and across six outings he allowed one run on two hits and seven walks while striking out six across 5.1 frames. Santos has joined the Mariners in Houston and will operate out of the bullpen as Seattle makes a final push for a wild-card spot. To make room on the big-league roster for Santos, left-hander Jhonathan Diaz was optioned to the minors.

Red Sox manager Alex Cora said Sunday that he will "mix and match" at closer with Slaten and Chris Martin following the season-ending injury to Kenley Jansen (shoulder), Gabrielle Starr of the Boston Herald reports.

Slaten has looked sharp since returning from his elbow injury last month, posting a 1.69 ERA and 12:2 K:BB over 10.2 innings covering 11 appearances. Cora indicated Sunday that he envisions the Rule 5 pick as a potential long-term closer option, and the 27-year-old could get a look in the role this week. Jansen is an impending free agent, so Boston will be looking for a new closer next season.

Red Sox manager Alex Cora said Sunday that he will "mix and match" at closer with Martin and Justin Slaten following the injury to Kenley Jansen (shoulder), Gabrielle Starr of the Boston Herald reports.

Martin stepped into the closer role for the Red Sox late last season after Jansen's campaign ended prematurely and will now be in the mix for saves again for the final week of this year. The veteran reliever has put up a 3.48 ERA and superb 48:2 K:BB over 41.1 innings out of Boston's bullpen this season.

The Red Sox placed Jansen on the 15-day injured list Monday with right shoulder inflammation, Jen McCaffrey of The Athletic reports.

The move was reported Sunday and now the transaction is official, which ends Jansen's season. Jansen has battled through a shoulder problem throughout this month, and since the Red Sox are out of the playoff hunt, they have opted to go ahead and shut him down. The Red Sox will turn to Chris Martin and Justin Slaten as closer options over the final week of the season. Jansen will be a free agent this offseason and has likely thrown his last pitch for the Red Sox.

The Tigers are expected to designate Miller for assignment prior to Tuesday's game against the Rays, Evan Woodbery of MLive.com reports.

Detroit plans to call up top pitching prospect Jackson Jobe in a corresponding move, with the young right-hander set to take Miller's spot on the 40-man roster and in the big-league bullpen. Miller has made 51 appearances for Detroit this season, logging a 4.53 ERA, 0.97 WHIP and 49:13 K:BB across 55.2 innings while gathering six wins, five holds and two saves.

The White Sox claimed Marinaccio off waivers from the Yankees on Monday.

The White Sox had the highest waiver priority of any team and used it to scoop up Marinaccio, who had been designated for assignment by the Yankees last Friday. Marinaccio has spent a large chunk of 2024 in the minors, but he's posted a career 3.22 ERA and 137:61 K:BB over 114.2 innings covering parts of three seasons in the majors. He's been optioned to Double-A Binghamton for the time being.

Yarbrough came away with a no-decision in Sunday's loss to the Rays, allowing one run on two hits and a walk over four relief innings. He struck out five.

Taking the mound with one out in the second inning after an impressive stint from opener Ryan Burr, Yarbrough tossed 54 pitches (38 strikes) and held Tampa Bay scoreless, only to watch Zach Pop let his inherited runner cross the plate in the sixth. Yarbrough has a 1.98 ERA, 0.59 WHIP and 12:3 K:BB over 13.2 innings in September across five appearances, but it's not clear if he'll get another scheduled turn as a bulk reliever before the end of the season.

Herrin (5-1) was charged with the loss Sunday against the Cardinals after giving up one run on a hit-by-pitch over one inning.

The hit batsman (Lars Nootbaar) was the only baserunner Herrin allowed in his appearance. Andrew Walters faltered in relieving Herrin, walking two batters and uncorking a wild pitch that allowed that the decisive run to score. It's a tough way to lose a 9.2-inning scoreless streak, but Herrin has been excellent in a mostly low-leverage role this year. He's pitched to a 1.98 ERA, 0.96 WHIP and 66:25 K:BB across 64.2 innings while adding 15 holds, though he hasn't seen consistent usage as a setup man.

Chargois was charged with his second blown save of the season in a loss to the Rangers on Sunday, allowing an earned run on a solo home run and a walk over one inning. He struck out one.

Chargois' outing had a little bit of everything, with the veteran right-hander allowing a game-tying, one-out solo shot to the second batter he faced in the seventh inning, Leody Taveras. Chargois would get out of the frame without any further damage, but he set the early stage for a critical loss for the Mariners. The 33-year-old came into the outing on a nine-appearance run of strong performances, as he'd allowed just one earned run on two hits and three walks over his previous 7.2 innings.