The Mets are a step above the faulty Marlins that 20-year-old Didier Fuentes faced in his MLB debut, and it showed on Wednesday night. The young Braves starter surrendered six runs in 3.1 innings, as the Braves fell to the Mets 7-3 at Citi Field. Fuentes has high upside — his pitch arsenal includes a fastball that averaged over 96 mph in his two starts — but the appearances showed he needs more time to develop. It can either let Fuentes work through his obstacles in the big leagues, citing his stuff as a reason for optimism, or it can call up someone else to fill Chris Sale’s spot in the starting rotation until he returns from a fractured rib cage.