Meaning, no hits, no walks, no runners on base, period. Something even more rare than no-hitters are perfect games, where the game is truly perfect. However, they have let batters on base by walks, or by being hit by a pitch. To break it down, a no-hitter is when a pitcher allows no hits during a game. If you’re a baseball novice that has just started watching this season, you may not fully understand how rare these events typically are. If you have paid attention to Major League Baseball at all so far this season, you likely know how regularly we have already been seeing no-hitters.