Scott (back) played catch in the outfield at Minute Maid Park on Tuesday, Brian McTaggart of MLB.com reports.

Scott just landed on the 15-day injured list over the weekend with a thoracic spine strain, so it's a good sign that he's already throwing again. He will not be eligible to return before the end of the regular season, but the Astros are hoping to have him available as an option at some point during the playoffs.

The Astros recalled Dubin from Triple-A Sugar Land on Tuesday, Brian McTaggart of MLB.com reports.

Dubin has posted a 4.15 ERA and 45:26 K:BB over 43.1 frames with the Astros this season. The 29-year-old right-hander will give the club a fresh bullpen arm.

The Astros optioned Martinez to Triple-A Sugar Land on Tuesday, Brian McTaggart of MLB.com reports.

Martinez had pitched two of the last three days, including Monday, and allowed four runs over 2.1 innings. He'll be replaced on the roster by fellow reliever Shawn Dubin.

White (elbow) will throw a bullpen session Tuesday, Evan Petzold of the Detroit Free Press reports.

It would appear to be the first time White has thrown from the mound since he underwent a hydrodissection procedure last month to address radial nerve-related symptoms. The right-hander is done for the season, but if the procedure has the desired effect he should have a normal offseason and be ready to go for spring training.

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.