The Boston Red Sox have acquired Drew Pomeranz from the San Diego Padres in exchange for 18-year-old prospect Anderson Espinoza.

"I'd rather trade three [lesser]-type guys than Anderson, but that wasn't appealing to San Diego," Dave Dombrowski said. "They really wanted more of the focus of the premium guy. There's always risk with pitchers, no matter how old they are. We know that Drew hasn't thrown this many innings. We think he can handle it. We also know there's a risk in Anderson, a young pitcher that we like a great deal."

Pomeranz is scheduled to make his Red Sox debut Wednesday at Fenway Park against the San Francisco Giants.

Espinoza, ranked No. 14 on ESPN Insider Keith Law's midseason top 50 prospects list, was one of the most gifted arms in a Boston farm system that hasn't produced a homegrown starter since Clay Buchholz in 2007.