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.

Contreras (illness) is in the starting lineup for Friday's game against the Cubs.

A stomach bug kept Contreras out for Wednesday's series finale against the Dodgers, but it would seem he's already moved past it. While he's just 1-for-11 in his career so far against Friday's starter, Matthew Boyd, Contreras has a .906 OPS against left-handed pitching for the season.

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.

Steer is not in the starting lineup against the Pirates on Friday.

Steer has been an everyday presence at first base for Cincinnati, but he'll get a rest Friday while Miguel Andujar starts in his stead. The Reds likely hope the time off will reset Steer's bat, as he's gone just 2-for-21 through six games in August.

Triolo went 2-for-4 with two RBI and a run scored Thursday against the Reds.

Triolo has started six of eight games since Ke'Bryan Hayes was traded, with his primary on-field value coming from his glove. However, he managed a two-RBI single in the first inning Thursday to make a rare offensive contribution. Triolo has gone 6-for-20 with three RBI and five runs scored across his six starts since inheriting the starting role, with the last three starts coming at shortstop while Isiah Kiner-Falefa has shifted to third base.

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.