First of all thanks for organzing this! I do know how much time is involved with these things. I did one big contest for the past worldcup.

Secondly I do like the format but depending on the number of participants a tie for the weekly price is very good possible.
There are 2 ways you can avoid this.

• by asking an extra question (still posibilities on a tie)
• by sorting the winners by the time of registration

I personally would go for the first option. The second option would give steemians in a different time zone a disadvantage.

Extra questions could be:

• number of goals in all 5 games
• number of yellow cards
• time of the first goal
• number of corners in all 5 games
  And so on.

Asking 2 extra questions will even decrease thr change on multiple winners.
Cheers,
Peter