Mateo (concussion) was reinstated from the 7-day injured list and is starting at shortstop Tuesday against Atlanta, David O'Brien of The Athletic reports.

The 28-year-old is back on Baltimore's active roster after missing little more than the seven-day minimum due to a concussion. Mateo has a .741 OPS with three homers and 10 steals through 42 contests this season and was operating as the Orioles' primary second baseman prior to the stint on the injured list.

The Royals placed Frazier on the bereavement list Tuesday.

Frazier will be away from the team as he tends to personal matters. Nick Loftin should continue to see plenty of action at second base while Garrett Hampson should mix in at the keystone. First baseman Nick Pratto was called up in a corresponding move.

Massey (back) took swings and played catch Monday, Anne Rogers of MLB.com reports.

Massey received multiple injections after being examined by a back specialist in late May and is finally ready to ramp things back up. There's no guarantee his recurring back issues won't flare up again, but for now Massey looks to be trending in the right direction.

Norby is out of the lineup for Monday's contest against the Rays.

Norby has now started just four of eight games since his promotion from Triple-A Norfolk, including only two of the previous six contests. With Jorge Mateo's (concussion) return from the 7-day injured list seemingly imminent, Norby could be headed back to Norfolk soon. Jordan Westburg will start at second base Monday while Ramon Urias occupies the hot corner.

Rengifo went 2-for-4 with two steals and a run in Sunday's 9-7 win over the Angels. He was also hit by a pitch.

Rengifo ended a mini 0-for-8 skid at the plate with two hits Sunday and managed to swipe two more bags to bring him up to 17 for the year. Rengifo already has five steals in eight games this month and now sits tied for sixth in baseball. He now has eight multi-hit efforts over his last 18 games and continues to be one of the most consistent hitters in the Angels' lineup. The 27-year-old is now slashing .316/.367/.448 with four homers, 18 RBI, 25 runs and a 12:27 BB:K in 189 plate appearances.

Altuve went 4-for-5 with a two-run homer, three RBI and two runs scored in Sunday's loss to the Angels.

Altuve's big hit of the day came with two outs in the sixth to cap off a four-run rally that put the Astros ahead 7-4. It was his first time with four hits in a game since Sept. 4, 2023, and it was his eighth time this year with three or more hits in a game. Altuve is now tied for fourth in the majors with 80 hits on the year and is putting together another strong campaign at the dish. He's slashing .297/.348/.454 with 10 homers, 25 RBI, 39 runs and an 18:53 BB:K in 290 plate appearances.

Semien went 1-for-3 with a home run, two RBI, a stolen base and an additional run scored in Sunday's 7-2 win over San Francisco. He was also hit by a pitch.

Semien was integral as the Rangers built an early 5-0 lead after two innings. He was hit by a pitch to lead off the bottom of the first, stole second base, then came home on Wyatt Langford's single. An inning later, Semien deposited a first-pitch slider into the stands in left for a two-run home run. He's reached base safely in nine straight games, going 11-for-31 (.355) with seven walks, two homers, three RBI and eight runs scored.

Orioles manager Brandon Hyde said Mateo (concussion) won't be reinstated from the 7-day injured list when first eligible Monday but could be activated Tuesday, Jake Rill of MLB.comreports.

The 28-year-old suffered the concussion June 2 against Tampa Bay and was able to ramp up his baseball work this weekend. Mateo won't be ready after spending the 7-day minimum on the shelf, but it appears his absence won't extend much beyond that.

Gelof is out of the lineup for Sunday's game against the Blue Jays, Martin Gallegos of MLB.com reports.

Gelof has started in all 47 games he's been healthy this season but will step out of the starting nine Sunday after going 0-for-9 with four strikeouts in his past four contests. Aledmys Diaz will handle the keystone and bat eighth in the series finale versus Toronto.

Norby is not in the starting lineup for Sunday's game against the Rays.

Norby started in Saturday's 5-0 win, going 1-for-4 while scoring a run. With Norby beginning Sunday's game in the dugout, Jordan Westburg will shift to second base, while Ramon Urias starts at the hot corner against Tampa Bay right-hander Zack Littell. Since being promoted from Triple-A Norfolk on June 3, Norby has gone 3-for-14 with one home run and two RBI.