The Royals placed Frazier on the 10-day injured list Monday with a right thumb strain.

Frazier suffered the injury during Saturday's 6-0 loss to the Rangers during a collision in the field with teammate Garrett Hampson. It's not clear how long he'll be out, but the issue was deemed significant enough to keep Frazier on the shelf until at least early July.

The Royals activated Massey (back) from the 10-day injured list Monday. He'll serve as the Royals' designated hitter and No. 5 batter in Monday's game against the Marlins.

Massey has been limited to just 29 games this season because of a pair of back-related absences. He responded well to a recent pain-killing injection, however, and is ready to rejoin the Royals after completing a five-game rehab assignment with Triple-A Omaha this past week. There's certainly risk in another aggravation of the back issue, but Massey is worth picking up in fantasy leagues where available given how well he had been hitting before getting hurt (.835 OPS in 110 plate appearances with Kansas City).

The Reds selected Jordan's contract from Triple-A Louisville on Monday.

A minor-league Rule 5 pickup over the offseason, Jordan will get his first call to the big leagues at 28 years old. Jordan slashed .302/.384/.443 with five home runs and six stolen bases this season with Louisville while seeing time at left field, center field, second base and third base. He'll make his MLB debut at a new position Monday against the Pirates, starting in right field and batting eighth. The righty-hitting Jordan will likely see most of his starts against left-handed pitching while he's up with the Reds.

Valdez is out of the lineup for Monday's game against the Blue Jays, Gabrielle Starr of the Boston Herald reports.

Since he was recalled from Triple-A Worcester on May 29, Valdez has operated in the strong side of a platoon at second base while slashing .308/.390/.654 with four home runs and one stolen base over a stretch of 20 games. Though his performance doesn't warrant a downturn in playing time, Valdez could nonetheless find himself as the odd man out of the lineup against right-handed pitching as a consequence of the Red Sox regaining health in the outfield. The recent returns of Tyler O'Neill and Wilyer Abreu from injuries will push Ceddanne Rafaela from center field to shortstop and David Hamilton from shortstop to second base Monday, leaving no room for the lefty-hitting Valdez even though Toronto will bring a righty (Chris Bassitt) to the hill.

Lowe (toe) remains out of the lineup for Monday's game against the Mariners.

Lowe suffered a fractured right pinky toe when he was hit by a pitch in Saturday's 4-3 loss to the Pirates. While the plan is for him to attempt to play through the injury, Lowe has now missed two straight starts. Richie Palacios will again handle second base while Lowe stays off his feet.

Mateo is out of the lineup for Monday's game against the Guardians.

Mateo appeared to have settled into an everyday role at the keystone around mid-June, but the Orioles may now be viewing him as more of a part-time player. He'll take a seat for the third time in five games, with Mateo's absence in the lineup opening up a starting spot in the infield for Ramon Urias.

The Mariners activated Polanco (hamstring) from the 10-day injured list Monday.

Polanco was sidelined for just under a month with a right hamstring strain. He went 6-for-20 in six games between High-A Everett and Triple-A Tacoma during his rehab assignment, slugging three home runs over his final two contests. Polanco has slashed a disappointing .195/.293/.302 across 181 plate appearances for Seattle this season. He'll resume his role as the club's everyday second baseman.

Loftin went 0-for-4 in Sunday's 4-0 loss to the Rangers.

Though Loftin didn't provide any noteworthy production Sunday, he occupied the leadoff spot for the Royals for the second time in four games. While Kansas City hasn't yet settled on a permanent option atop the batting order, manager Matt Quatraro seems to have at least temporarily pulled the plug on the slumping Maikel Garcia as the club's leadoff hitter. With Garcia batting seventh and eighth in the final two games of the series in Texas, both Loftin and Adam Frazier received looks in the leadoff spot, though Loftin's assignment Sunday might have been a byproduct of Frazier missing the game with a thumb sprain. Even if Loftin sets the table for Kansas City again Monday versus Marlins, he may not stick in the everyday lineup for long. Michael Massey (back) is nearing a return from the 10-day injured list and likely to take back a regular spot at second base.

The Orioles designated Maton for assignment Monday.

Maton will be pushed off roster as the Orioles make room for outfielder/first baseman Heston Kjerstad, who was recalled from Triple-A Norfolk in a corresponding move. During his five-day stay with the Orioles, Maton saw action in just one game and didn't receive any plate appearances.

Rodgers went 2-for-4 Sunday against the Nationals.

Rodgers was activated from the injured list Friday after missing around two weeks with a hamstring injury, and he was in the starting lineup both Saturday and Sunday. He hit cleanup on both occasions, going a combined 3-for-8 with a home run and three RBI. The Rockies will head on a five-game road trip starting Tuesday, and Rodgers has hit just .239 with no home runs away from Coors Field this season.