Sports Photography with a Leica?!?
Sure, why not! I tried it at this year's BMW Frankfurt Marathon, just to see if it works. No program mode, no AF, no 20 fps... Sit by the side of the road, pre-focus on an old chewing gum stuck to the street, and wait for the runners to come into view.
Actually by keeping your second eye open you can predict the timing quite well :)
All shots taken with a Leica M-P and a Summilux 50mm.