St. Louis Cardinals outfielder Joshua Baez made Major League Baseball history on August 15, 2026, by becoming the first player to hit three home runs in his major league debut.

The rookie achieved the unprecedented feat during his first big league game, marking a singular milestone in the sport's extensive statistical record.

No previous player had accomplished a three-homer debut since the league began tracking official statistics.

The performance immediately placed Baez alone at the top of a specific historical category that had never been reached before.

Details regarding the opposing team, the specific innings in which the home runs occurred, or the final score of the game were not provided in the source material.

The event stands as a discrete athletic achievement without broader institutional or commercial implications.

Baez entered the game as a Cardinals rookie outfielder and left with a unique place in baseball history.

The milestone is recognized as a first-of-its-kind occurrence in MLB annals.

Sources and further reading

WATCH: Joshua Baez becomes first MLB player to hit 3 homers in debut

This is an independent summary. The complete reporting, supporting context and any primary documents remain with ABC News.