Anyway the answer was Frank Robinson, 1975 off of Doc Medich....
Pretty dramatic when you think about it, first black manager, Jackie Robinson's wife in attendance and Frank goes yard his first time up...I would love to have seen it, also Medich knocked Robinson down earlier in the AB.
Frank Robinson is also the alltime leader in opening day longballs with 8.
In his last at bat the next year in a game at Baltimore, Robinson delivered an RBI pinch hit single off Rudy May, ending his HOF career in poetically and in style .
He is one of the games greatest all-time players and most underrated .