PORT ST. LUCIE — A week into his spring training, Brett Baty has been limited only to taking defensive reps at first base. The hamstring twinge he felt before reporting to camp here hasn’t popped up since he first felt it, but the Mets are still playing it safe as they convert their third baseman into a utility man. Like Baty, Jorge Polanco is also on a slower spring progression and learning first base. As the Mets begin Grapefruit League play, the plan is to split time at first with Polanco and Baty, using Baty when Polanco is in the lineup as a DH, though both...
