Vientos thought his drought would end at some point soon. “Just a matter of time,” he told The Post succinctly before the Mets’ 4-1 win over the Cardinals at Citi Field. That “matter of time” turned out to be about four hours later.

Mark Vientos hit his first homer of the season to spark a four-run second inning, and the New York Mets beat the St. Louis Cardinals 4-1 in the opener of a four-game series.