Some players kick dirt on the mound, others play with the rosin bag ... meanwhile, Reds pitcher Hunter Greene's starting his very own pre-pitch ritual -- puking on the mound!!!
Yes, it happened ... again.
25-year-old Greene was on the bump in the 5th inning in a game against the Cardinals ... when the young star turned his back to the mound, and put his glove up to his face before vomit started spraying out between the webbing.