Joshua Báez has been in the majors for a matter of days and he already did something no one in modern MLB history had done: homer in each of his first three career at-bats. Not his first game. His first three swings that counted. St. Louis called him up and he answered by rewriting a record book before he'd even learned where the visiting clubhouse showers are.
Now the Cardinals take that story to Philadelphia, and the sportsbooks have followed him there with a home run prop for the next chapter. Nobody keeps up a pace like that. That's not how baseball works, and it's not how this prop should be read either. But that's exactly why it's irresistible: the entire baseball world is watching to see how long a stretch like this can possibly last, and this game is the next data point.
Báez doesn't have to hit a fourth one for the story to matter. He already has the story. The only question left is what you think happens next, right here, in Philadelphia, when he steps in against a Phillies pitching staff that has scouted absolutely nothing on him yet.