The New York Times today reports that Ralph Branca's mother was born a Jew. This might explain why he gave up the infamous homer to Bobby Thompson - October 3, 1951 was, in fact, Tzom Gedalia! (confirmed by HebCal!)
The idea that Branca was fasting was presciently suggested by Rav Aharon Lichtenstein (to R. Binyamin Tabory). I wrote about that here.