New York Mets corner infielder Mark Vientos is in the midst of a disappointing season, one in which he's failed to build on last year's momentum. Predictably, Vientos has found himself the subject of recent trade rumors leading up to the July 31 deadline -- a dynamic he opted to talk about with reporters on Monday.

Here's what you need to know about the trade deadline, including the top players on the trade block and what moves the Yankees and Mets have made so far. In years prior, it used to be set in stone on July 31 at 4 p.m. ET. According to MLB.com, the commissioner's office can set the deadline from a date range of July 28 and Aug. 3.

St. Louis Cardinals closer Ryan Helsley "is one of the most popular trade targets" ahead of the MLB trade deadline, according to MLB.com's Mark Feinsand.