Having scored for AYSO for several years, this is a problem I understand pretty well!
There are always two teams in a match. You'll get two reports for each match, one report from each team with scores for both teams.
You'll probably want one table for team information, one for match information (showing which teams play each other when and where), one for match scores (match, team, score, and reporter), and probably one table for player information. You'll have to figure out how to match players to teams, especially if one play can play on more than one team!
I suspect that you'll need to report any discrepancies in match scores to the league scorekeeper for resolution. There isn't a way I know to do that in code.
-PatP