Westburg left Monday's game against the Red Sox due to an apparent lower-body injury, Roch Kubatko of MASNSports.com reports.

Westburg suffered the injury while scrambling back to first base after making a hard turn towards second, and after being checked out by the team trainer, it was determined that he couldn't continue. He'll be considered day-to-day until the club has more news on the severity of the injury.

Rengifo is not in the Angels' starting lineup against the Reds on Monday.

Rengifo will be absent from the Halos' lineup for the third time in four games despite going 12-for-39 (.308) with two steals, two triples, 10 runs, two homers and six RBI since the beginning of August. Christian Moore will start at second base for Monday's series opener and bat seventh.

Jung is not in the lineup for Monday's contest against the Royals.

It's the second straight day Jung has been out of the lineup, though he did appear as a pinch hitter in Sunday's win over the Blue Jays. Jung is in a 5-for-35 drought at the dish and will once again yield the hot corner to Cody Freeman.

Riley ran the bases Sunday but still felt some abdominal discomfort, Mark Bowman of MLB.com reports.

He will run again Tuesday, but a timeline for Riley's return to the Atlanta roster remains unclear. Riley has been sidelined for most of this month with a strained lower abdominal muscle. Nacho Alvarez will continue filling in at third base for Atlanta until Riley is ready to return from the injured list.

Norby (wrist) will begin a rehab assignment with Triple-A Jacksonville on Wednesday, Christina De Nicola of MLB.com reports.

Norby needed surgery in mid-July to address a fractured hamate bone in his left hand, but he's now ready to test out the surgically repaired wrist in a game setting. If all goes well during his rehab assignment, he should rejoin the Marlins' 26-man active roster before the end of August.

McKinstry is out of the lineup for Monday's game against the Astros.

The left-handed-hitting McKinstry had started in each of the last four games while the Tigers faced right-handed pitchers, but he went just 2-for-15 during that stretch to bring his batting average down to .258 for the season. The Tigers will go up against another righty (Spencer Arrighetti) on Monday, but McKinstry will give up his spot in the lineup to Trey Sweeney, who draws the start at shortstop.

The Red Sox recalled Eaton from Triple-A Worcester on Monday.

Eaton will join the 26-man active roster in place of Rob Refsnyder (oblique), who was placed on the 10-day injured list. The utility player previously went 6-for-24 with three stolen bases over 14 games with the big club earlier this season. The right-handed-hitting Eaton is unlikely to see many starts versus right-handed pitching, but he could have a regular spot in the lineup versus lefties. He'll serve as Boston's designated hitter and leadoff batter in Monday's matchup with Orioles southpaw Trevor Rogers.

The Marlins placed Pauley on the 10-day injured list Monday with a right oblique strain.

Miami hasn't shed light on the severity of the injury that Pauley sustained over the weekend, but given that even mild oblique strains typically entail more than a 10-day recovery, the 24-year-old is unlikely to return from the IL when first eligible Aug. 27. Miami recalled infielder Maximo Acosta from Triple-A Jacksonville in a corresponding move, but Javier Sanoja and Eric Wagaman may be likelier candidates to pick up starts at third base while Pauley is on the shelf.

The Mariners optioned Mastrobuoni to Triple-A Tacoma on Monday.

Mastrobuoni was designated as the Mariners' 27th man for Sunday's 7-3 loss to the Mets in the Little League Classic in Williamsport, Pa. and did not appear in the contest. He's heading back to Tacoma as the Mariners return to a standard 26-man active roster ahead of Monday's series opener in Philadelphia.

Dodgers manager Dave Roberts said that Muncy's (oblique) condition is improving, and the 34-year-old is scheduled to take part in some "rotational" work Monday, Fabian Ardaya of The Athletic reports.

Though Muncy's oblique strain is of the mild variety, the Dodgers are still expecting him to miss more than the minimum 10 days after he landed on the injured list Friday. Muncy is still in the early stages of his recovery program, so a clearer timeline for his return from the IL is unlikely to become available until he's able to take part in full baseball activities. While Muncy has been out of action for the Dodgers' last four games, Alex Freeland has made three starts at third base and Buddy Kennedy has made one start.