On the mound, Brandon Sproat and Tylor Megill told very different stories. With 19 games left, the contrast between these outings begins to shape the Mets’ rotation, hinting at which arms could play a role in the final weeks, and which questions remain to be answered. The Mets have a sharper look at their rotation going forwardMegill’s latest rehab start didn’t exactly help his case to rejoin the Mets rotation. Sent down to recalibrate, Senga’s spot in the rotation went to Brandon Sproat, who found himself on a major-league mound for the first time Sunday. Sproat provided it with a debut worth building on, while Megill’s outing reminded everyone his path back won’t be straightforward.