Access the Mets beat like never before Join Post Sports+ for exciting subscriber-only features, including real-time texting with Mike Puma about the inside buzz on the Mets. Try it free PHILADELPHIA — The Mets could be facing another significant roster decision as soon as Monday. Mark Vientos is nearing a return from the right hamstring strain that has cost him almost three weeks, and manager Carlos Mendoza indicated before Sunday that the third baseman could be activated for the start of a four-game series against the Braves at Citi Field. Vientos played Sunday in a minor league rehab game for Triple-A Syracuse and went 1-for-5 as the starting third baseman. Vientos is 2-for-17 (.118) over four