His bat has gone quiet again, leaving the New York Mets with a tough decision at the worst possible time. August teased something different, a stretch where Vientos looked like he was finally settling in and giving the Mets a much-needed boost. The Mets can’t afford nostalgia for last month’s progress when October is on the line. The Mets can’t ignore Mark Vientos’ struggles as the postseason picture tightensAugust felt like the breakthrough. The power that once looked sustainable has fizzled, leaving the Mets with a middle-of-the-order bat that's producing more whiffs than fireworks.