Alvarez (back) isn't in the Mets' lineup Saturday against Milwaukee, Anthony DiComo of MLB.com reports.

Alvarez had to make an early exit from Friday's contest due to back spasms, and while his back is reportedly feeling better, per DiComo, he's not quite ready to return to the starting lineup. Luis Torrens will catch for Jose Quintana and bat seventh.

Fortes isn't in the Marlins' lineup for Saturday's game against Toronto.

Fortes went 0-for-4 during Friday's series opener and will now hand catching duties over to Jhonny Pereda, who will bat ninth.

Bart isn't in the Pirates' lineup for Saturday's game against the Yankees.

After tallying six hits over his last five games, Bart will take a seat Saturday against Luis Gil and company. Yasmani Grandal will start behind the dish while batting seventh.

Murphy went 1-for-3 with two-run homer in Friday's 3-0 victory over Kansas City.

The Atlanta backstop opened the game's scoring with a 372-foot, two-run shot off Brady Singer in the fourth inning, marking just his fourth September hit in 43 plate appearances. This is the fourth time Murphy has reached double-digit homers in his six-year career. Overall, the 29-year-old is slashing .197/.284/.360 with 18 runs scored and 25 RBI in 257 plate appearances across 70 games.

Alvarez was removed from Friday's game against the Brewers with back spasms, Will Sammon of The Athletic reports.

Alvarez was grabbing at his back immediately after sliding into third base during the seventh inning and stayed on the ground for some time before being helped into the dugout by the Mets' trainers. The severity of his injury remains unknown, but Luis Torrens would be the next man up behind the dish if Alvarez needs to miss some time.

Smith is not in the starting lineup for Friday's game against the Rockies, David Vassegh of AM 570 LA Sports reports.

Smith has gone 3-for-13 with one home run and two RBI over his last four games. He'll get some rest Friday, with Austin Barnes serving behind home plate and batting ninth.

D'Arnaud is out of the lineup for Friday's game against Atlanta.

D'Arnaud will take a seat for a second consecutive game, giving way to Sean Murphy behind the dish. D'Arnaud hasn't had a multi-hit game since Aug. 13.

Herrera went 1-for-3 with a solo home run and a walk in Thursday's 10-8 loss to the Rockies.

This was Herrera's second homer in his last four games, though he hasn't seen steady playing time in that span. He got a start at designated hitter Thursday with Pedro Pages behind the dish. Herrera has hit well but not for much power this year with a .298/.368/.427 slash line, five home runs, 27 RBI, 37 runs scored, 12 doubles and five stolen bases over 71 contests.

Pages went 1-for-4 with a two-run home run during Thursday's 10-8 loss to the Rockies.

Pages launched a two-run homer off Angel Chivilli in the eighth inning to give the Cardinals an 8-5 lead but the advantage was erased when Colorado put up five runs in the bottom of the frame. The long ball was Pages' seventh of the season, and he's slashing .236/.275/.361 across 209 plate appearances.

The Dodgers optioned Feduccia to Triple-A Oklahoma City on Thursday, Kirsten Watson of Spectrum SportsNet LA reports.

Feduccia appeared in three games after Austin Barnes hit the 10-day injured list Sept. 16. In that small sample, Feduccia went 3-for-10 with a walk and RBI. Barnes was activated off the injured list in a corresponding move Thursday.