Considering how long the game of baseball has been around, and how many games are played each year, it seems like a safe bet to assume that everything has happened at least once. But that’s not always the case. Last month, in a 3-0 win over the Marlins, Astros star Jose Altuve became the first player to hit two doubles and two triples in a game without scoring a run. And last season, Yankees rookies Tyler Austin and Aaron Judge became the first pair of teammates to hit back-to-back home runs in each player’s first big league at bat. In most cases, of course, it’s easier to know what has taken place than it is to figure out what’s still left to accomplish, but with the help of the Baseball-Reference play index, we’ve dug up 15 things that have still never happened in a major league game:

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