The Cubs optioned Hollowell to Triple-A Iowa on Friday, Taylor McGregor of Marquee Sports Network reports.

The right-hander was called up by Chicago on Tuesday and will head back to Triple-A to clear roster space for the club's trade deadline additions. Hollowell fired a scoreless inning Tuesday and has given up just one earned run across 7.1 frames in the majors this season.

Kinley gave up two hits and a walk in a scoreless seventh inning during Thursday's extra-inning win over the Reds. He struck out one.

Making his debut for Atlanta after being acquired from Colorado on Wednesday, Kinley was brought in with the game tied 3-3 and nearly made a mess of things, loading the bases with one out before getting Spencer Steer to pop out and fanning Jake Fraley. With closer Raisel Iglesias surprisingly still on the roster after the trade deadline, Kinley will be on the fringes of high-leverage work for his new club while Pierce Johnson and Dylan Lee continue to handle setup duties.

Johnson (2-3) picked up the win in Thursday's 12-11 extra-inning victory over the Reds, striking out one in 1.1 perfect relief innings.

The right-hander was viewed as a potential closer candidate for the final two months of the season if Raisel Iglesias got dealt, but with Iglesias still in Atlanta after the trade deadline, Johnson will remain in a setup role. He put an impressive July in the books during which he posted a 0.75 ERA, 0.50 WHIP and 10:2 K:BB over 12 innings while notching one win and three holds in 12 appearances.

Iglesias earned the save in Thursday's 12-11 win over the Reds in 10 innings. He struck out one in a scoreless inning.

Iglesias was seen as a likely trade candidate, though he ultimately remained with Atlanta following Thursday's deadline. Brought in to protect a one-run lead in the 10th inning, Iglesias set the Reds down in order, locking down his 13th save in 18 chances this season. After a shaky start to the year, Iglesias has now held opponents scoreless in 19 of his last 21 appearances. His ERA sits at 4.74 with a 1.15 WHIP and 48:10 K:BB across 43.2 innings.

Vrieling was traded from the Yankees to the Giants on Thursday along with Jesus Rodriguez and Parks Harber in exchange for Camilo Doval, Jack Curry of YES Network reports.

Vrieling has a 4.50 ERA, 1.52 WHIP and 42:18 K:BB in 46 innings across 12 appearances at Double-A. The 24-year-old righty has a good curveball and cutter and may fit better in the bullpen long term.

The Brewers acquired Miller (forearm) and left-hander Jordan Montgomery (elbow) from the Diamondbacks on Thursday in exchange for a player to be named late, Robert Murray of FanSided.com reports.

Miller has been on the shelf since July 7 with a strained right forearm, but after turning in a 1.98 ERA and 0.96 WHIP in 36.1 innings with Arizona, he'll most likely take on a high-leverage role in Milwaukee's bullpen once healthy. However, after notching 10 saves for Arizona prior to getting hurt, Miller is unlikely to be in line for many ninth-inning chances in Milwaukee while Trevor Megill has performed as one of the top closers in baseball this season. Miller recently resumed throwing bullpen sessions and should soon face hitters again before likely heading out on a brief minor-league rehab assignment prior to being activated from the 15-day injured list.

Hales was traded from the Rangers to the Cardinals on Thursday along with Mason Molina and international bonus pool money in exchange for Phil Maton, Katie Woo of The Athletic reports.

A pure reliever, Hales has had flashes of looking like a future late-inning arm, but he has struggled to prevent runs this year in the upper minors. The 23-year-old righty has a 7.64 ERA and 3.88 xFIP in 33 innings, primarily at Double-A, so he has been pretty unlucky while logging a 40:14 K:BB and five saves.

The Pirates traded Rogers to the Cubs for Ivan Brethowr on Thursday, Danny Demilio of PittsburghBaseballNow.com reports.

Rogers' stay with the Pirates did not last long after he was traded from the Reds to Pittsburgh on Wednesday. As expected, the reliever was acquired by the Pirates to be flipped, which landed the Pirates an outfield prospect. Rogers should serve as a high-leverage relief option in Chicago.

The Pirates acquired Sisk and Callan Moss from the Royals on Thursday in exchange for Bailey Falter, Alex Stumpf of MLB.com reports.

Sisk has spent most of the campaign at the Triple-A level, though he did make his MLB debut for the Royals earlier this year and gave up one earned run with an 11:5 K:BB across 5.1 innings. He'll have a clearer path to the big-league bullpen in Pittsburgh.

Linan was traded from the Dodgers to the Nationals on Thursday along with Eriq Swan in exchange for Alex Call, Andrew Golden of The Washington Post reports.

Linan put up silly numbers at Single-A to start the year (1.21 ERA, 0.84 WHIP and 50 strikeouts in 29.2 innings) and has been excellent after a promotion to High-A, where he has a 2.65 ERA, 1.10 WHIP and 39 strikeouts in 37.1 innings. Linan's changeup is easily his best pitch, and he could run into more trouble in the upper levels.