Once a highly touted prospect, New York Mets catcher Francisco Alvarez was optioned to Triple-A Syracuse on Sunday in the wake of his offensive struggles this season.Alvarez, 23, baseball’s No. 1 prospect in 2022 who hit 25 home runs as a rookie in 2023, is hitting just .236 with three homers and 11 RBIs in 35 games this season.In a corresponding move, the Mets recalled Hayden Senger to serve as the backup to starter Luis Torrens.After making a splash as a 21-year-old rookie, Alvarez has been hampered by multiple wrist and hand injuries and regressed last year.