Vespi was recalled by the Orioles on Friday from Triple-A Norfolk.

The left-hander will return to the majors just two days after being optioned down, as starter Dean Kremer gets put on the 15-day injured list. Vespi has only appeared in one major-league game this year, sporting a 3.22 ERA, 1.45 WHIP and 26:13 K:BB across 22.1 innings for Norfolk.

Tate was recalled by the Orioles on Friday from Triple-A Norfolk.

Tate was sent down at the end of April, but he will be brought back up to take the place of Jonathan Heasley in the bullpen. Tate has appeared in 11 games with the Orioles this season, logging a 2.84 ERA and 1.03 WHIP with a 6:6 K:BB across 12.2 innings.

The Royals designated Duffey for assignment Friday.

The right-hander was added to the Royals' roster in late April and posted a 5.00 ERA, 1.67 WHIP and 10:8 K:BB over nine innings during his month in the majors. Duffey was removed from the 26-man and 40-man rosters to clear a spot for the return of Carlos Hernandez (shoulder).

The Royals reinstated Hernandez (shoulder) from the 15-day injured list Friday.

Hernandez was shut down at the start of spring training due to a pinched nerve in his right shoulder, but he's ready to join the Royals after an eight-game rehab assignment with Triple-A Omaha. The right-hander recorded four saves and 17 holds last season but had a 5.27 ERA and 1.33 WHIP across 70 innings.

Bielak (1-0) picked up the win in an extra-innings victory over the Rockies on Thursday, allowing a hit and a walk over one-third of an inning. He struck out one.

Bielak came into the game with runners at the corners and two outs in the top of the 11th, and after allowing both inherited runners to score, he was able to strike out Jordan Beck to end the inning. That set the stage for the unlikeliest of victories, as the Athletics mounted a five-run rally in the home half of the frame to walk it off. Bielak, who was just acquired via trade from the Astros on May 16, has allowed two earned runs on eight hits and a walk over 5.2 innings across three appearances since his arrival.

The Twins recalled Alcala from Triple-A St. Paul on Friday, Do-Hyoung Park of MLB.com reports.

The club had previously optioned Caleb Boushley and now have announced Alcala as his replacement on the roster and in the bullpen. In eight appearances this season, Alcala has collected a 3.27 ERA and 10:6 K:BB. He figures to be utilized in middle relief.

Pop worked a scoreless seventh inning Thursday to record his second hold of the season in a win over the Tigers.

Entering the game to protect a two-run lead, Pop needed only seven pitches (six strikes) to set down the middle of Detroit's batting order. The right-hander has been effective since his promotion in late April, posting a 3.60 ERA, 1.00 WHIP and 7:1 K:BB in 10 innings, but he could be the pitcher who gets bumped out of the big-league bullpen when Chad Green (shoulder) comes off the IL.

The Twins optioned Boushley to Triple-A St. Paul on Thursday.

The club will announce a corresponding move prior to Friday's game against the Rangers. Boushley has yielded two runs over two relief innings during his brief time in the majors this season.

Saucedo (knee) struck out one over a scoreless inning Thursday in his first rehab appearance with Triple-A Tacoma.

Saucedo landed on the 15-day injured list a little over two weeks ago with a hyperextended right knee. Because he hasn't missed much time, the left-handed reliever shouldn't need more than a couple rehab appearances, setting himself up for a return within the next few days.

Kimbrel picked up the save Thursday, getting the final two outs in an 8-6 victory over the White Sox.

Jonathan Heasley stayed in the game to start the ninth inning with the O's ahead 8-2 after getting the last out in the eighth, though he would quickly run into trouble after failing to retire the first four batters he faced in the final frame. He would be relieved by Yennier Cano, but Cano allowed three inherited runners to score while getting only one out, making it an 8-6 ballgame. That's when Kimbrel came in to save the day, needing just two pitches to record a bizarre double play as Andrew Vaughn was called out for runner's interference on an infield fly. The veteran reliever has converted all three of his save attempts this month after blowing back-to-back saves to close out April. Kimbrel also hasn't allowed any hits or walks in those three appearances with five strikeouts.