Ronald Acuna Jr. became the youngest player in Major League Baseball history to hit a grand slam during the postseason with his second-inning blast against the Los Angeles Dodgers on Sunday night.
At 20 years and 293 days old, Acuna broke a record held by Hall of Famer Mickey Mantle, who hit a playoff grand slam at the age of 21 years, 349 days, per ESPN Stats & Info.
Following the game, the Atlanta Braves phenom said he had never heard of Mantle, telling Fabian Ardaya of The Athletic, "I wasn't even born."
In fact, Mantle's grand slam, which was hit in Game 5 of the 1953 World Series, happened more than 44 years and two months before Acuna was born.
Even further, Mantle's last game, played in 1968, was played almost three full decades before Acuna's birth.
In his rookie campaign, Acuna authored a remarkable .293/.366/.552 slash line with 26 home runs and 16 stolen bases. By comparison, Mantle's 96-game rookie season yielded a .267/.349/.443 slash line with 13 homers and eight swiped bags.
