Guerrero (elbow) threw a 25-pitch live batting practice session Aug. 12 and could soon head out on a rehab assignment, MLB.com reports.

Guerrero is eligible to be activated from the 60-day injured list later this week, but he'll need additional time to complete a rehab assignment before making his return to the Boston bullpen. Before landing on the shelf June 28 due to a right elbow strain, Guerrero compiled a 4.15 ERA, 1.33 WHIP and 10:14 K:BB in 17.1 innings over 13 appearances.

The Athletics announced Aug. 12 that Holman (finger/shoulder) has advanced to gripping drills and is building toward a throwing progression, MLB.com reports.

Holman has been stuck on the injured list since June 19, and though he's no longer shut down from activity, he remains without a clear timeline for a return. The reliever was initially placed on the shelf due to rotator cuff tendinitis in his right shoulder, but the Athletics are now classifying his injury as a strained right middle finger.

Walker earned the save in Sunday's 4-3 win over the Brewers, allowing one hit while striking out two in a scoreless ninth inning.

With Randy Rodriguez (arm) unavailable Sunday, the Giants turned to Walker in the ninth inning to protect a one-run lead. The right-hander was able to work around Sal Frelick's two-out single to lock down his 11th save this season and first since May 25. Walker has been sharp of late, turning in six straight scoreless appearances and posting a 0.77 ERA over his last 11.2 innings. He'd be the favorite for the ninth-inning job going forward should Rodriguez miss any additional time.

Megill (5-3) took the loss and a blown save Sunday against the Giants, allowing two runs on three hits and a walk in the ninth inning. He struck out two.

While trying to protect a one-run lead in the ninth, Megill allowed the Giants to load the bases before giving up a two-run, two-out hit to Heliot Ramos. Megill's now been saddled with a blown save in two straight appearances and three of his last four outings. Overall, he's converted 30 of 36 save chances this year while posting a 2.54 ERA with a 1.15 WHIP and 58:17 K:BB across 46 innings.

Rodriguez was unavailable for Sunday's 4-3 win against the Brewers due to right arm soreness, Shayna Rubin of the San Francisco Chronicle reports.

Rodriguez was tagged with the loss in Friday's 5-4 defeat in Milwaukee, and he apparently torqued something in his pitching arm in the process. Ryan Walker was called upon to protect the Giants' one-run lead in the ninth inning Sunday, working around a two-out single by Sal Frelick to earn a save. Rodriguez still appears to be in the driver's seat for the ninth-inning role with San Francisco, and he can be considered day-to-day ahead of Monday's off day.

Gomez did not factor into the decision Sunday against Minnesota, allowing two hits and three walks over 4.2 scoreless innings. He struck out six.

While Gomez was able to hold the Twins scoreless, he was unable to qualify for a win after throwing 89 pitches before departing with two outs in the fifth inning. Still, the 25-year-old Gomez has been solid overall in three starts since shifting into the rotation, allowing four earned runs across 14.2 innings while striking out 16. He's currently lined up to face the Yankees at home his next time out.

Estevez earned the save in Sunday's 10-8 win over the Tigers, striking out one in a perfect ninth inning.

Estevez has been perfect in five straight appearances while posting a 1.29 ERA in his last seven innings. He's up to 34 saves on the year, tied with Robert Suarez for the MLB lead, with a 2.67 ERA, 1.08 WHIP and 48 strikeouts across 57.1 innings.

The Angels placed Mederos on the 15-day injured list Sunday due to right shoulder inflammation.

Mederos made his third start of the season in Saturday's 12-1 loss to the Cubs and was the pitcher of record after yielding six earned runs on four hits and two walks across four innings. Following the game, Mederos told Jeff Fletcher of The Orange County Register that his shoulder felt off toward the end of his start, and the Angels decided to deactivate him while they look to glean more information about the injury. Mederos is expected to undergo an MRI in the coming days before the Angels provide a potential timeline for his return. Caden Dana delivered a 13-strikeout gem in his most recent start with Triple-A Salt Lake on Friday and could be a top candidate to step in for Mederos the next time his turn in the rotation comes up.

The Angels placed Fulmer on the 15-day injured list Sunday due to right elbow inflammation.

According to MLB.com, Fulmer sustained the injury while throwing a changeup during his relief appearance in Saturday's 12-1 loss to the Cubs. Before departing, Fulmer was charged with six earned runs on seven hits and one walk over 1.1 innings, bringing his ERA up to 5.83 for the season. Though the Angels are labeling his injury as inflammation, Fulmer will undergo further testing as the team looks to rule out a more significant issue to his elbow, per Jeff Fletcher of The Orange County Register.

The Angels recalled Silseth from Triple-A Salt Lake on Sunday.

Though he's made most of his appearances in the big leagues the past three seasons as a starter, Silseth transitioned to a full-time relief role at Triple-A in late July after returning from a stint on the 7-day injured list. He's thrived out of the bullpen for Salt Lake, tossing 8.2 scoreless frames while striking out 13 over his last nine appearances. The right-hander will likely be deployed by the Angels in lower-leverage spots initially but could work his way up the bullpen depth chart quickly if he excels early on with the big club.