In MLB, April 18, 1955 off of Don Liddle of the New York Giants.
his first home run was 600 feet in baltimore
Daniel Sepic of Pennsylvania hit the first ever home run.
Babe Ruth hit his first home run in 1915. As he was born in 1895, he would be 20 years old when he hit his first home run.
October 10, 1972 off Ross Grimsley of the Cincinnati Reds in Game 4 of the NLCS.
Travis Lee (who???) hit the first home run in the first regular season home game played on March 31, 1998
The first batter in either the top or the bottom of an inning hits a home run. By definition, this is a one-run homer, because it is impossible for any runner to be on base when the first batter comes up.
Babe Ruth hit his first home run in 1915 with the Boston Red Sox.
Mulder was the first pitcher to hit a home run at the new Busch stadium!
Dolph Camilli hit the first ever televised home run as the Dodgers beat the Reds 6-1.
No, he hit a walk off home run in his first major league game but it was not his first at-bat.
baseball
Magglio