During the 2016 MLB All-Star break, the Padres traded Pomeranz to the Boston Red Sox for Anderson Espinoza, a highly regarded minor league pitching prospect. On September 16, 2016, Padres general manager A. J. Preller was suspended for 30 days for keeping two sets of medical records for players—one internal and one for league use. There had been several instances of duplicate records, but the suspension was handed out specifically with respect to the Pomeranz trade.