If teams can get together for a one race match they may as well do a complete tourney against each other, even if it's only a 6 race tourney it's better than just one. It's completely random with only 1 race. It's equivalent to tossing a coin. Which, btw, was going to be my earlier suggestion, but I ended up deleting it. If the teams really are that close, can't agree on a tie breaker and just can't be separated by anything but luck, then toss a coin and let luck decide. Bigger and more official competitions have been decided that way in the past. (Probably the least popular suggestions ever, should I hide?)