It may be that the race is not always to the swift, nor the battle to the strong — but that’s the way to bet.

Hugh E. Keough (1864-1912) Canadian-American sports journalist

(Attributed)

Variants:

• "The race is not to the swift, nor the battle to the strong; but the betting is best that way."
• "To be sure the race is not always to the swift, nor the battle to the strong; but it is ninety-nine times in a hundred."

Also attributed to Damon Runyon, Franklin Pierce Adams, Grantland Rice, and Burns Mantle, all of of whom in turn credited Keough. The saying itself, a take-off on Ecclesiastes 9:11, has a number of antecedents: see here for more background.