The Brewers placed Miller on the 60-day injured list Wednesday due to a right elbow UCL sprain.

Miller suffered the injury during an appearance in Monday's 10-8 loss to the Phillies. According to Adam McCalvy of MLB.com, Miller acknowledged that he could require the second Tommy John surgery of his career to address the UCL injury, but even if he opts to treat the injury with rest and rehab, he won't be eligible to pitch again this season. Joel Payamps was recalled from Triple-A Nashville to take Miller's spot on the 40-man roster and in the bullpen.

The Nationals claimed Lao off waivers from the Mariners on Wednesday and optioned him to Triple-A Rochester.

Lao has been knocked around during his brief time in the majors, but he's collected a 3.13 ERA and 73:19 K:BB over 69 innings this season at Triple-A Tacoma. He'll report to Rochester for now but could get a look with the major-league club before the end of the season.

Thielbar tossed a scoreless inning of relief with a strikeout to record a hold in Tuesday's 4-3 win over Atlanta.

Thielbar is now up to 19 holds for the year, which is good for second on the team behind Brad Keller's 22. The veteran lefty has been locked in lately, as he's recorded nine straight scoreless appearances. Overall, Thielbar has an elite 1.99 ERA and 0.83 WHIP to go along with 48 strikeouts in 49.2 innings out of the bullpen this season, his first with the Cubs.

The Reds recalled Richardson from Triple-A Louisville on Wednesday.

Richardson will provide the Reds with a fresh arm after they went with a bullpen game in Tuesday's 12-9 loss to the Blue Jays. He's collected a 3.93 ERA and 30:20 K:BB over 36.2 frames during his time with the big club this season.

The Reds optioned Sanmartin to Triple-A Louisville on Wednesday.

Sanmartin gave the Reds 1.2 innings out of the bullpen in his lone day with the team, giving up one unearned run in Tuesday's loss to the Blue Jays. Lyon Richardson was recalled from Triple-A to take Sanmartin's spot on the active roster and in the bullpen.

Santana gave up one run on one hit and one walk in the ninth inning Tuesday to record his 12th save of the season in a 9-7 win over the Dodgers.

The right-hander had plenty of cushion, allowing him to convert his sixth straight save chance. Since a shaky five-run outing at Coors Field in his first appearance following David Bednar's trade to the Yankees, Santana has looked the part of the Pirates' closer, posting a 2.92 ERA, 0.97 WHIP and 8:4 K:BB over his last 12.1 innings.

The Mets recalled Herget from Triple-A Syracuse on Tuesday.

Herget was touched up for three runs over 2.1 innings in Tuesday's win over the Tigers. The righty reliever will operate in a low-leverage role in the Mets' bullpen down the stretch.

Chandler (2-0) picked up the win Tuesday over the Dodgers, giving up three runs on six hits over four relief innings in a 9-7 victory. He struck out three without walking a batter.

Entering the game in the third inning to piggyback Carmen Mlodzinski once again, Chandler racked up an impressive 22 called or swinging strikes on only 50 pitches (34 total strikes), but he also served up his first two homers in the majors, getting taken deep by Shohei Ohtani and Andy Pages. Through his first three appearances with the Pirates, Chandler has lasted exactly four innings each time, producing a 2.25 ERA, 0.83 WHIP and 9:1 K:BB. If the Bucs maintain that piggyback arrangement, the duo will be lined up to take the mound again this weekend at home against the Brewers -- setting up a potential marquee matchup of flame-throwing rookies between Chandler and Jacob Misiorowski.

Ferrer earned another save in Tuesday's 5-2 win over the Marlins, tossing a perfect frame while striking out one.

Ferrer closed the door on the Marlins for a second straight day and now has converted a save in five of his last seven appearances. He's slid into the closer role admirably since the departure of Kyle Finnegan at the trade deadline, tossing 13.1 scoreless frames since Aug. 3 while posting a 12:1 K:BB.

Palencia allowed two hits and no walks in scoreless ninth inning for the save Tuesday against Atlanta, striking out one.

Palencia has now yielded multiple hits in three of his last four outings, but he was able to hang on for his 22nd save of the season Tuesday. The right-hander has certainly been shaky of late, logging a 4.76 ERA and 1.85 WHIP over his last 11.1 innings since the start of August, though he remains Chicago's clear-cut closer. For the year, Palencia owns a 2.16 ERA and 1.10 WHIP while successfully converting all but two of his save opportunities across 50 innings.