In love with friend advice?

Hey all, I'm just wondering if anyone has any suggestions for someone who is incredibly infatuated with a good friend. I am about 90% sure he doesn't feel the same, but I want to tell him because -- as we all know , you always hold on to that 10%. I know I won't get over it until I know for sure there is no chance with us, so I need to tell him.

Anyone have any positive stories of this not turning out super awkward afterwords? I'm not exactly sure how to go about it..