The Mariners designated Hahn for assignment Friday, Shannon Drayer of SeattleSports.com reports.

Hahn has given up four runs (three earned) with a 3:5 K:BB over five innings this season with the Mariners. He wound up re-signing with Seattle after being removed from its 40-man roster in April, but it's not clear what his intentions are this time around.

The Athletics recalled Lopez from Triple-A Las Vegas on Friday, Martin Gallegos of MLB.com reports.

Lopez is expected to start Friday against the Phillies, as J.T. Ginn (quadriceps) recently landed on the 15-day injured list. Lopez made a spot start against the Rangers back on April 29, allowing three earned runs on six hits and four walks across 2.2 innings of work. He struck out four and took the loss. Lopez could make multiple starts for the Athletics while Ginn is sidelined.

The Tigers optioned Guenther to Triple-A Toledo on Friday, Evan Petzold of the Detroit Free Press reports.

Guenther has yielded seven runs (six earned) with an 8:5 K:BB over 10.1 innings with the big club this season. He's clearing out to make room on the roster for the return of Matt Vierling (shoulder).

The Mariners outrighted Lawrence to Triple-A Tacoma on Friday.

Lawrence cleared waivers after being designated for assignment earlier in the week. The 37-year-old appeared in five games out of the bullpen for Seattle, logging a 3.00 ERA and 6:1 K:BB across 15.1 innings.

Speier allowed one hit in a scoreless inning with no strikeouts during Thursday's 9-2 loss to the Astros.

Speier turned in his seventh scoreless outing out of nine appearances in May. On the season, the 30-year-old owns a 2.25 ERA, 0.90 WHIP and 28:4 K:BB with seven holds over 20 innings. Speier has been one of Seattle's top high-leverage options as the team's lone left-hander, locking into a setup role ahead of closer Andres Munoz.

Zeferjahn recorded a hold against the Athletics on Thursday, allowing one hit and issuing one walk while striking out one batter in one scoreless inning.

Zeferjahn entered in the eighth inning with the Angels up two runs and quickly got into trouble, allowing a walk and a single to the first two batters he faced. However, the righty reliever then induced a double-play groundout before striking out Brent Rooker to escape the jam. Zeferjahn has claimed a high-leverage role in a beleaguered Angels bullpen -- he's registered a hold in five straight outings to move into the team lead with eight this season. His 4.50 ERA and 1.50 WHIP on the campaign aren't great, but he has 26 punchouts (along with 10 walks) in 18 frames while adding two wins and a save.

Lauer is slated to start Friday's game against the Rays in Tampa.

The veteran lefty will pick up a second straight start and his third straight turn through the Toronto rotation, as he had previously served as a bulk reliever behind Jose Urena in a May 11 win over Seattle. Lauer has made four appearances in total for Toronto this season and owns a 2.25 ERA, 0.83 WHIP and 14:3 K:BB across 12 innings. He should be able to hold down a rotation spot until either Max Scherzer (thumb) is cleared to return from the 60-day injured list, or Spencer Turnbull is built up enough in the minors.

Fisher (1-0) picked up the win Thursday, recording the final out in the top of the 11th inning in a 7-6 victory over the Padres.

Brendon Little allowed the phantom runner to score in both the 10th and 11th frames, but Fisher retired Elias Diaz to close out the 11th and then fell into the win column when the Blue Jays scored twice in the bottom of the inning. It was Fisher's first career win in the majors in his fifth appearance, and the 24-year-old righty has been very effective so far in a low-leverage role, posting a 0.00 ERA, 0.56 WHIP and 6:0 K:BB in 5.1 innings.

King allowed two hits across a scoreless seventh inning Thursday against the Mariners.

King split 2024 evenly between Houston and Triple-A Sugar Land, but he broke camp with the big-league club this season and has excelled. He has held opponents scoreless in 21 of his 23 appearances and has also tallied 10 holds, the second-highest mark on the team.

Hoffman picked up his third blown save of the season, surrendering two runs on two hits while striking out one in Thursday's 7-6 extra-innings win against the Padres.

The month of May continues to be a struggle for Hoffman with all three of his blown saves coming in the last couple weeks. In his last eight appearances, the 31-year-old has allowed 13 runs, and his ERA has ballooned up to 6.04 after an April that saw him finish at 1.17. Hoffman's 13.7 K/9 is still elite, so his closer spot perhaps isn't in danger just yet, but he'll likely have to regain his footing soon to retain the closer role over the likes of Yimi Garcia and Chad Green.