Keiichi Hirano was hit by a pitch thrown by Toshiya Sugiuchi in the top of the 3rd inning of Tuesday's game against the Yomiuri Giants. The ball hit Hirano on the right side of the head (on the helmet). He was treated and remained in the game until he was replaced on defense in the bottom of the 4th.
Hirano was taken to the hospital for tests. No abnormalities were discovered. Whether he plays on Wednesday will depend on how he is feeling before the game.
Source: Nikkan Sports 6/18/2014