I doubt that there would be a major difference to things such as football. I've never really seen any use for using the Imperial system.

I used to be a Warhammer 40K player, and even then, I found it annoying to use the inch bars to measure mortar fire range. Centimeters would have been perfect for a purpose like that.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram