David Jose Hernandez (born May 13, 1985 in Sacramento, California) is an American baseball player. He currently plays as a relief pitcher for the Arizona Diamondbacks of Major League Baseball (MLB). He was drafted by the Baltimore Orioles with the 483rd overall pick in the 16th round of the 2005 Major League Baseball Draft. He debuted for the Orioles on May 28, 2009 in a game against the Detroit Tigers. He was traded to the Arizona Diamondbacks along with Kam Mickolio for Mark Reynolds and a player to be named later or cash.