The Padres selected Eflin, 20, in the first round of the 2012 First-Year Player Draft. He went 10-7 with a 3.80 ERA in 24 starts last season with Class A Advanced Lake Elsinore.
The Phillies had No. 15 prospect Severino Gonzalez pitch Tuesday against the Braves. He allowed three hits and struck out two in three scoreless innings. No. 2 prospect Aaron Nola pitched Friday against the Yankees. He allowed five hits and struck out four in three scoreless innings.
Todd Zolecki is a reporter for MLB.com. Read his Phillies blog The Zo Zone. Follow him on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.