Alvarez was called up to the Mets' big league roster and is set to make his major-league debut Friday against Atlanta, Tim Healey of Newsday reports.
Darin Ruf: Lands on 10-day IL
Ruf was placed on the 10-day injured list with a neck strain Friday, retroactive to Sept. 27.
Eduardo Escobar: Carries offense with five RBI
Escobar went 3-for-5 with a home run and five RBI in Wednesday's 5-4 victory over the Marlins.
Starling Marte: No return date established
Mets manager Buck Showalter said Wednesday that Marte's fractured right middle finger remains immobilized, and the outfielder won't be able to throw or hit until the swelling and discomfort subsides, Anthony DiComo of MLB.com reports.
Bryce Montes de Oca: Starts up rehab assignment
Montes de Oca (hamstring) began a rehab assignment at Triple-A Syracuse on Sept. 20 and has struck out five while allowing three hits and two walks across 2.2 scoreless innings between his two appearances.
Pete Alonso: Launches 40th homer
Alonso went 1-for-4 with a three-run home run in Tuesday's 6-4 loss to the Marlins.
Carlos Carrasco: Downed by Marlins
Carrasco (15-7) took the loss Tuesday as the Mets fell 6-4 to the Marlins, giving up four runs on six hits and a walk over three innings. He struck out two.
Francisco Lindor: Trio of hits, runs, RBI
Lindor went 3-for-5 with a double, three runs and three RBI in a 13-4 win against the Athletics on Sunday.
Mark Vientos: Hits first career homer
Vientos went 1-for-3 with a solo home run and a walk in a 10-4 loss to the Athletics on Saturday.
Jeff McNeil: Collects three hits
McNeil went 3-for-5 with a double, two runs and an RBI during Friday's 9-2 victory over Oakland.