The Cardinals placed Arenado on the 10-day injured list Friday with a right shoulder strain.

Arenado's shoulder has been bothering him for about a month, which was reflected in his .175/.230/.211 slash line for the month of July. He'll now take at least 10 days to recover from his strain properly; meanwhile, Nolan Gorman (back) will return from the injured list to take Arenado's place at the hot corner.

The Cardinals are expected to place Arenado on the 10-day injured list prior to Friday's game against the Padres due to a right shoulder injury, Katie Woo of The Athletic reports.

The veteran third baseman played through the injury for most of July, which may have affected him at the plate as he had a .175/.230/.211 slash line in 17 games during the month. Arenado will be eligible for reinstatement August 10 but is without an official timeline for his return.

Hayes went 1-for-5 with a three-run homer in Thursday's 12-11 loss to Atlanta.

After homering just once in 392 plate appearances with the Pirates this year, Hayes went deep in his first game with the Reds, kick-starting Cincinnati's rally in an eight-run eighth inning. Hayes, whose previous homer came June 10, is slashing .235/.278/.297 with 39 RBI, 35 runs scored and 10 stolen bases this season. While Hayes plays excellent defense at third base, he could find himself in a part-time role after the Reds made another trade for Miguel Andujar on Thursday.

Wagner was optioned to Triple-A El Paso on Thursday.

Wagner was dealt from the Blue Jays to the Padres on Thursday but is currently blocked by both Ryan O'Hearn and Gavin Sheets. That leaves him without a spot in the big leagues, though that could change prior to the close of the regular season. Across 132 plate appearances with Toronto, Wagner hit .237/.336/.298 with a 15:26 BB:K.

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

Harber has been on the injured list since mid-June with an undisclosed injury. Prior to that, the 23-year-old corner infielder slashed .326/.395/.489 with three home runs and two steals in 34 games at High-A.

The Reds acquired Andujar from the Athletics on Thursday in exchange for right-hander Kenya Huggins, Robert Murray of FanSided.com reports.

After hitting two home runs Wednesday in what will end up being his final game with the Athletics, Andujar will pack his bags and leave for Cincinnati. Although the Reds acquired Ke'Bryan Hayes from Pittsburgh on Wednesday and will likely lean on him as its primary third baseman. Andujar's .765 OPS should make him a viable backup option on days when the Reds want to prioritize offense at the hot corner. Andujar is also capable of playing either corner-outfield spot as well as designated hitter, though his right-handedness could force him to settle for the short side of a platoon with Jake Fraley, Gavin Lux or Will Benson.

Wagner was traded from the Blue Jays to the Padres on Thursday in exchange for Brandon Valenzuela.

Wagner's role in San Diego is to be determined, as the Padres also acquired Ryan O'Hearn and already have Gavin Sheets in terms of lefty-hitting corner bats. Wagner slashed .237/.336/.298 with zero home runs and one steal in 132 plate appearances in the majors this season.

The Cardinals acquired Jordan from the Red Sox on Wednesday exchange for left-hander Steven Matz, Jeff Passan of ESPN.com reports.

Since being promoted to Triple-A Worcester in early June, Jordan has slashed .289/.333/.476 with six home runs. 24 RBI and 29 runs scored through 177 plate appearances. The 22-year-old corner infielder's performance could put him in the running for a promotion once major-league rosters expand in September, though he would need to be placed on the Cardinals' 40-man roster before earning his first taste of the big leagues.

Machado went 2-for-5 with two RBI and a stolen base in Wednesday's 5-0 win over the Mets.

Machado opened the scoring with a two-run single in the second inning and followed it up by swiping his 10th bag of the year. The 33-year-old has been red hot during an eight-game hitting streak, piling up seven multi-hit efforts, six extra-base hits, 11 RBI, four runs and two stolen bases. For the year, he's slashing .302/.362/.510 with 20 home runs, 71 RBI, 64 runs scored and the aforementioned 10 steals across 467 plate appearances.

The Reds acquired Hayes from the Pirates on Wednesday in exchange for shortstop Sammy Stafura, left-hander Taylor Rogers and cash considerations, Jeff Passan of ESPN.com reports.

Hayes will greatly improve Cincinnati's defense at third base, as he is arguably the best defender in the game at the hot corner. The 28-year-old's offense is a much bigger question, as he's slashing only .236/.279/.290 with two home runs in 100 games this season and has an underwhelming .254/.307/.369 batting line in his career. Hayes should benefit from a major park upgrade in going from PNC Park to Great American Ball Park.