Lowe went 0-for-3 with a walk and run scored in Saturday's 5-2 loss to Atlanta.

Lowe was activated off the injured list and made his season debut, batting fifth and playing first base. He should be the primary first baseman going forward against lefties or righties.

Red Sox manager Alex Cora said Saturday that Casas is undergoing tests for a rib injury, Chris Cotillo of The Springfield Republican reports.

Cora noted that it's not an oblique injury which forced Casas from Saturday's game against the Pirates after just one plate appearance. However, the skipper admitted to having some concern about the first baseman, so it certainly seems as though the injury list is a possibility. The results of Casas' tests should be available later Saturday or Sunday.

Casas left Saturday's game against Pittsburgh due to left rib discomfort, Chris Cotillo of The Springfield Republican reports.

Casas sustained the injury after a swing during his first plate appearance and was removed from the game before the bottom of the first inning. It remains unknown whether or not he will require a trip to the injured list, but it's possible the Red Sox hold the 24-year-old first baseman out of the lineup for at least a game or two to allow him to properly recover.

Casas was removed from Saturday's game against the Pirates due to an apparent injury, Chris Cotillo of The Springfield Republican reports.

Casas was grabbing at his left side after a swing during his plate appearance in the top of the first inning. He remained in the game to run the bases after drawing a walk but was replaced at first base heading into the bottom half of the frame. The Red Sox will offer more information on Casas' status once they are able to take a closer look at him.

The Rangers designated Walsh for assignment Saturday.

Walsh will lose his spot on the roster with Nathaniel Lowe (oblique) returning from the injured list Saturday. The 30-year-old slashed .226/.317/.321 across 60 plate appearances during his time with Texas and could attract interest on the waiver wire from any team in need of help at first base.

The Rangers reinstated Lowe (oblique) from the 10-day injured list Saturday.

The Rangers have been without Lowe all season after he suffered a right oblique strain during spring training. He played six games with Triple-A Round Rock during his rehab assignment and went just 3-for-20 with a homer and four RBI, though he capped off his time in the minors with a 2-for-4 performance Thursday. The 28-year-old will slide back into his usual role as Texas' everyday first baseman and figures to provide a solid boost to the Rangers' lineup. Jared Walsh was designated for assignment in a corresponding move.

Santana isn't in the Twins' lineup for Saturday's game against the Tigers, Evan Woodbery of MLive.com reports.

Santana has now sat out three of Minnesota's last four games after slashing .125/.210/.143 across his first 15 games. His absence Saturday will move Alex Kirilloff to first base while Austin Martin, Byron Buxton and Trevor Larnach start across the outfield.

Casas went 1-for-4 with a walk and solo home run in Friday's 8-1 win over the Pirates.

Casas belted a homer in the first inning, his fifth long ball in the last 10 games. The 24-year-old first baseman leads Boston with 10 RBI and is second with six home runs.

Pasquantino went 1-for-3 with a home run and scored three times during Friday's win over the Orioles.

Pasquantino's fourth-inning shot put the Royals ahead 1-0, and he drew a walk in the sixth to help spark a five-run inning that would keep Kansas City in front for the remainder of the game. The 26-year-old first baseman is slashing an incredible .481/.559/1.111 with four homers and 11 RBI during his seven-game hitting streak.

Naylor went 1-for-4 with a solo home run en route to a 10-2 win against the Athletics on Friday.

Naylor's eighth-inning blast hardly had any impact on the outcome of the game, but it pushed his hitting streak to seven games and represents his fourth long ball across his last nine contests. The 26-year-old first baseman is now slashing .319/.395/.594 across 69 plate appearances on the year.