On August 31 of this past season, the Rockies’ Stephen Cardullo homered in both ends of a doubleheader AND it was his birthday. He’s just the 4th guy to accomplish this feat since 1913, and there’s a good chance nobody else did it before then.
Players to HR in both ends of a double header on their birthday since 1913:
Stephen Cardullo 8/31/2016
Tony Perez 5/14/1972
Joe Rudi 9/7/1970
Eddie Joost 6/5/1949
Double headers are so rare right now (the Rockies/Dodgers one this year was likely because of a rainout on a Tuesday as both games were played on a Wednesday) that it seems pretty unlikely anybody will ever again achieve this–although I would have said the same before this season 🙂