-1.5 sets bets player must win in straights and not lose a set
-1.5 games means has to win at least by two games
so 6-3 3-6 7-6 means player won by 1 game (+3 1st set, -3 2nd set, +1 3rd set = 1)
6-4 6-3 means a player won by 5 games
and in an extreme case, 0-6 6-4 6-1 means the losing player won the games (winning player wouldn't cover -1.5)