On September 15, 1990 — Brothers Billy and�Cal Ripken, in the first of the two times they will accomplish the feat, both homer in the same game. The siblings’ home runs are overshadowed by�Kelly Gruber’s three run round-tripper in the ninth inning that gives the Blue Jays a 4-3 walk-off victory over the Orioles at the Skydome.

 


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Sources:
Baseball Reference September 15
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game