Atlanta designated Petersen for assignment Sunday.

The right-hander was optioned to Triple-A Gwinnett in late June and has now also lost his place on the 40-man roster. Petersen could remain with Gwinnett if he passes through waivers unclaimed.

Atlanta optioned Hernandez to Triple-A Gwinnett on Sunday.

The right-hander enters Sunday having pitched three of the previous four days, so he'll head to the minors in favor of a fresh bullpen arm in right-hander Wander Suero, who was called up from Gwinnett. Hernandez has recorded seven holds with a 2.10 ERA, 1.30 WHIP and 30:24 K:BB across 30 innings this season, so he's a strong bet to rejoin Atlanta's bullpen during the second half of the campaign.

Atlanta selected Suero's contract from Triple-A Gwinnett on Sunday.

The right-hander inked a minor-league deal with Atlanta during the offseason and will join the big-league roster for the final game before the All-Star break. Suero pitched well in 33 outings for Gwinnett with a 1.50 ERA, 1.00 WHIP and 49:10 K:BB across 36 innings.

The Nationals recalled Lara from Double-A Harrisburg on Sunday.

Lara will provide some extra bullpen coverage in Sunday's series finale with the Brewers after the Nationals burned through four relievers Saturday. Washington optioned Shinnosuke Ogasawara to Triple-A Rochester following Saturday's game, and it's possible Lara ends up getting a look in the rotation to begin the second half. The 22-year-old right-hander has turned in a 7.50 ERA and 2.00 WHIP over 36 innings in the minors this season but was effective in his MLB debut July 2, holding the Tigers scoreless while striking out four over three innings.

The Mets optioned Warren to Triple-A Syracuse on Sunday.

After serving as the Mets' 27th man in Thursday's doubleheader with the Orioles, Warren was returned to Triple-A on Friday before being recalled later that day. He didn't end up making an appearance over the last two days and will once again return to the minors, this time to clear a spot on the active roster for Sean Manaea (elbow/oblique).

Rogers threw a scoreless ninth inning in Saturday's 2-1 loss to the Dodgers, allowing one hit.

Though he gave up one single Saturday, Rogers also induced three groundouts to end the frame efficiently, throwing eight of his 10 pitches for strikes. The right-hander hasn't allowed an earned run in six consecutive appearances and now owns a 1.55 ERA, 0.78 WHIP and a 34:4 K:BB across 46.1 innings in 48 outings.

Atlanta optioned Cox to Triple-A Gwinnett on Sunday.

Cox's latest stint with the big club lasted just under two weeks. He made four relief appearances following his July 2 call-up from Gwinnett, giving up one earned run on four hits and one walk over five innings. Cox will cede his spot on the active roster to right-hander Davis Daniel, who was recalled from Triple-A to either start or pitch in bulk relief Sunday in St. Louis.

Atlanta recalled Daniel from Triple-A Gwinnett on Sunday.

Daniel was recently placed on Gwinnett's temporary inactive list earlier this week for the birth of his child, but he's ready to return to action and will end up joining the big club for the second time this season, and the right-hander will start Sunday in St. Louis. Atlanta has a pair of open spots in its rotation, so with a respectable showing, Daniel could begin the second half in a starting role. Over 14 appearances (13 starts) at Gwinnett this season, Daniel owns a 3.27 ERA, 1.21 WHIP and 59:31 K:BB across 71.2 innings.

Vesia notched a hold against the Giants on Saturday by retiring both batters he faced in the eighth inning.

Vesia entered the contest in a huge spot, inheriting a bases-loaded, one-out situation with the Dodgers holding a 2-0 lead. The lefty was able to keep Los Angeles ahead, allowing a Rafael Devers sacrifice fly before getting Matt Chapman to ground into a fielder's choice. Vesia has been outstanding across the past six weeks, posting a 1.23 ERA, 0.48 WHIP and 18:2 K:BB over 14.2 frames while recording six holds and two saves across 18 appearances. He's been one of Los Angeles' top high-leverage arms throughout the campaign, and his 17 holds have already a established a new career high.

Morillo allowed four runs on five hits while striking out one over one inning in Saturday's 10-5 loss to the Angels.

Morillo, who entered the game to begin the eighth inning with a 0.82 ERA over his previous 14 outings, let a one-run deficit balloon to five by the time he was done. In the wake of several bullpen injuries, the rookie's name was recently floated for high-leverage situations, but he was not up to challenge Saturday. Although walks didn't play a role in Saturday's performance, control has been a challenge for Morillo, who owns a 5.3 BB/9.