Mountcastle went 1-for-3 with a solo home run in Friday's 3-2 win over the Athletics.

In his first at-bat since May 30, Mountcastle launched a 433-foot homer in the first inning that stood as the game-winner. The 27-year-old is slashing .247/.281/.363 with three homers, 16 RBI, 20 runs scored and one steal over 203 plate appearances this season and should see regular time at first base and designated hitter for the Orioles down the stretch.

Naylor (shoulder) is not in the Mariners' starting lineup against the Rays on Friday.

Naylor was forced to leave Thursday's game against the White Sox due to left shoulder soreness, and while he's not in Friday's lineup, he could be available as a pinch hitter, per Shannon Drayer of SeattleSports.com. With Naylor absent from the lineup, Donovan Solano will handle duties at first base and bat seventh while Jorge Polanco operates out of the cleanup spot.

Burger (quadriceps) was activated from the 10-day injured list Friday.

Burger is back on the active roster for the first time since being placed on the injured list July 16 with a strained left quad. He'll immediately join the starting nine, slotting in at DH and batting seventh for Friday's series opener against Philadelphia. Alejandro Osuna was optioned to Triple-A Round Rock in a corresponding move.

Mountcastle (hamstring) was reinstated from the 60-day injured list Friday, Roch Kubatko of MASNSports.com reports.

Mountcastle will make his first MLB appearance since May 30, when he sustained a Grade 2 hamstring strain. He'll DH and bat fifth Friday. Colton Cowser (concussion) and Tyler O'Neill (wrist) were placed on the injured list in corresponding moves.

Goldschmidt isn't part of the starting nine for Friday's game against Houston.

Goldschmidt is on the bench for a second straight game as Ben Rice fills in at first base. Goldschmit entered as a pinch hitter Wednesday -- the team's last game -- and delivered a solo home run. This is the first time the 37-year-old has been out of the team's starting lineup in back-to-back games since June 21-22.

Kavadas was optioned to Triple-A Salt Lake on Thursday.

Kavadas was recalled Tuesday but did not appear in a game before being sent back to Salt Lake. He's maintained an .821 OPS across 465 plate appearances at the level -- good for a 104 wRC+ -- so he could find his way back to Los Angeles later in the campaign.

Naylor exited Thursday's game against the White Sox due to shoulder soreness, Daniel Kramer of MLB.com reports.

Naylor grimaced during a swing in the third inning and departed shortly thereafter. The initial diagnosis doesn't sound particularly ominous with Naylor labeled day-to-day, though he could undergo imaging with more details to follow. The first baseman also played through some shoulder soreness in June, but it's unclear if that's related to the current injury.

Naylor was removed from Thursday's game against the White Sox with an apparent injury, Ryan Divish of The Seattle Times reports.

Naylor didn't seem very comfortable at the plate during either of his at-bats Thursday, and he was taken out of the game after grounding out to end the third inning. The Mariners haven't yet said what is bothering the 28-year-old first baseman, but more details will presumably come after he's evaluated by the training staff.

Goldschmidt went 1-for-2 with a solo home run in Wednesday's 3-2 win against Texas.

Goldschmidt didn't start, as Ben Rice instead got a turn at first base. However, Goldschmidt was called upon to pinch hit in the seventh inning and came through with a solo shot to left field to provide what proved to be the winning run. The veteran slugger may be regaining his power stroke, as he has two homers and a double over his past three games spanning 10 plate appearances. Prior to that, Goldschmidt went without a long ball for 31 consecutive contests.

Guerrero 4-for-7 with a double, a home run, four runs scored and two RBI in Wednesday's rout of the Rockies.

Guerrero launched his 18th homer of the year to right-center field off Victor Vodnik in the eighth inning. The 26-year-old slugger was a big part of Toronto's record-setting trip to the Coors Field, going 8-for-17 with two doubles, two homers, four RBI and seven runs over the three games, and both long balls were to the opposite field -- a very strong sign that Guerrero's getting his swing locked in and gearing up for a big finish to the summer.