Shewmake was optioned to Triple-A Scranton/Wilkes-Barre on Sunday.

Shewmake will open the season at Triple-A after going 1-for-12 with three strikeouts and a run scored over six games during spring training. The infielder will look to get into more of a groove at the plate with Scranton/Wilkes-Barre in order to potentially earn a promotion to the major-league roster down the road this summer.

Muncy will make the Athletics' Opening Day roster, Martin Gallegos of MLB.com reports.

Muncy will be set to make his major-league debut when the A's begin their 2025 campaign on the road against Seattle on Thursday. The infielder has produced a .289 average with one home run, seven RBI, seven runs scored and a stolen base over 38 at-bats ion 23 games during spring training. Muncy could begin the year as a starting option at second base due to Zack Gelof (hand) being unavailable for multiple weeks.

The Mariners optioned Rivas to Triple-A Tacoma on Sunday.

The 27-year-old was competing for a spot on Seattle's Opening Day bench but will instead begin the campaign back at Tacoma. Rivas had an .865 OPS in 63 games at Triple-A last year but struggled over 86 plate appearances in the big leagues with a .233/.333/.274 slash line.

Betts (illness) is starting at shortstop and batting second in Sunday's exhibition game against the Angels, David Vassegh of AM 570 LA Sports reports.

The 32-year-old flew back early from the season-opening series versus the Cubs in Tokyo while recovering from an illness, but he'll return to action for the final exhibition games of the spring. Betts should be ready to go at shortstop for Thursday's home opener against Detroit.

The Diamondbacks selected Hampson to the major-league roster Sunday.

The 30-year-old exercised the opt-out clause of his minor-league contract with Arizona on Friday, and the organization elected to fully bring him aboard rather than let him hit free agency. Hampson has a .300/.396/.375 slash line through 17 spring games, though he posted a career-worst .575 OPS in 113 regular-season contests for Kansas City last year. He likely won't have fantasy relevance while filling a utility role.

Brujan may get bumped off of Chicago's roster once Nico Hoerner (forearm) is able to return, Sahadev Sharma of The Athletic reports.

Brujan or Gage Workman are the two players most likely to lose their spot to Hoerner, but Workman would have to be returned to Detroit as a Rule 5 pick if he gets pushed off the MLB roster. Brujan is out of minor-league options himself, so he would need to be designated for assignment in that scenario. Hoerner could be ready for the domestic season opener or soon after, so neither player will have much time to make a positive impression.

GM Mike Elias announced Sunday that Henderson (side) will start the regular season on the injured list but hopes the absence will be measured in "days, not weeks," Jacob Calvin Meyer of The Baltimore Sun reports.

The news isn't exactly a surprise since Henderson hasn't seen game action since suffering the intercostal strain in late February, but his recent rehab progression gave him an outside chance of being ready for Opening Day. The 24-year-old took live batting practice Saturday and could be cleared to play in exhibition games in the near future, so there's optimism his absence to begin the season will be brief.

Lee said Sunday that he will start the regular season on the 10-day injured list due to lower-back tightness, Bobby Nightengale of The Minnesota Star Tribune reports.

The 24-year-old has been sidelined by the injury the past few days and won't be recovered in time for Thursday's season opener. Lee was expected to have a regular role at third base with Royce Lewis managing a hamstring strain, but now both players will begin the season on the shelf. Willi Castro and Jose Miranda are the likeliest candidates to see action at the hot corner.

Muncy could begin the season in the majors if Zack Gelof begins the season on the injured list due to a hand injury, Martin Gallegos of MLB.com reports. "Muncy has done a great job," said manager Mark Kotsay. "He's leaving a great impression and building confidence that he's knocking on the door to be here with this group."

Muncy is hitting .314 (11-for-35) this spring. It's still likely a longshot that he makes the roster since Gelof may only be out a short time, but the comments from the manager are notable. The A's more likely will want one of their top prospects playing every day at Triple-A.

Lee (back) didn't participate in on-field pregame drills Saturday and is not expected to play in Sunday's spring training game, the Minnesota Star Tribune reports. He had an MRI on his back Friday, MLB.com reports.

Lee hasn't played since he was scratched from Thursday's game due to lower-back tightness. If he misses more time, there's a good chance he'll begin the season on the injured list. Assuming any absence isn't lengthy, Lee looks set to get the bulk of playing time at third base with Royce Lewis likely out several weeks with a hamstring injury.