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By far the most aggressive team in this trading season, the Red Sox struck again Friday evening, acquiring All-Star lefthanded starting pitcher Drew Pomeranz from the Padres for highly-touted 18-year-old righty Anderson Espinoza, whom Baseball America rated the 15th-best prospect and fourth-best pitching prospect in the game on their midseason list released on Monday. The trade comes just five days after the Red Sox acquired reliever Brad Ziegler from the Diamondbacks to buttress an injury-ravaged bullpen and is part of their ongoing effort to fortify a pitching staff that had undermined the majors’ best offense during the first half of the season.