OAKLAND, Calif. - The Oakland A's sent minor league right-handed pitcher Ronald Herrera to the San Diego Padres as the player to be named later in the May 15 trade in which the A's acquired outfielder/first baseman Kyle Blanks from the San Diego Padres for minor league outfielder Jake Goebbert and a player to be named later.

Herrera was 3-4 with a 3.38 ERA in nine starts with Single-A Beloit. He allowed a .272 opponents batting average and issued 10 walks while striking out 35 in 50.2 innings. The 19-year-old Venezuelan was originally signed by the A's Dec. 11, 2011 and is 12-12 with a 3.36 ERA in 39 games, including 33 starts, in three seasons in the A's farm system.