Clifford D Simak's "Rule 18" (novelette, humor): How earth won it's first football match against Martians in decades
Title comes from one of the rules of the game that requires a player of the team to not only be natives of his world, but his 9 preceding generations should have been native of this world too. Coach will twist this rule in a curious way to win.
Update 21 July 2014: Marooned has a note on an Isaac Asimov connection to this story.
Fact sheet.First published: Astounding, July 1938.
Nominated for Retro Hugo Awards 1939 in novella category.
Among the stories from Astounding/Analog issues edited by John Campbell.
Related: Stories of Clifford D Simak.