Outfielder Mark Kotsay received a cortisone injection on Tuesday to help ease the pain in his lower back. He remains back in San Diego.
Major League baseball has announced a scoring change from May. 17. Los Angeles Dodgers outfielder Andre Either has been credited with a double off Volquez in the fifth inning of an 8-1 loss.
Outfielder Cameron Maybin was originally given an error on the ball that tipped off his glove. Volquez was charged with an earned run on the play.
Infielder Cody Decker has been promoted to the Padres' Triple-A club in Tucson.
Decker hit .286 with 14 home runs and 29 RBI in 42 games at Double-A San Antonio. He was named Texas League Player of the Week twice.