LOS ANGELES -- The Los Angeles Dodgers are concerned enough about some discomfort in Zack Greinke's elbow that they scratched his between-starts bullpen session heading into Thursday's outing.They are still hopeful Greinke will start Thursday, but it's a situation they're monitoring closely, particularly because they already have three starting pitchers on the 15-day disabled list, with two likely lost for the rest of the season."He was having some soreness and things like that," Dodgers manager Don Mattingly said.