LAWRENCEVILLE — The closer the Braves fall to the bottom of the NL East, the more their focus will shift to prospects acquired in a barrage of offseason trades. One of the top prospects is right-hander Matt Wisler, who came to Atlanta in the trade that sent closer Craig Kimbrel to San Diego on April 5. Wisler, 22, is gaining momentum at Triple-A Gwinnett, where he was just named the International League’s pitcher of the week.