Qualifying systems have a lot to do with the chances of the best losing and others winning. Chance plays a bigger role in single matches than in many. National qualifiers in Latin America leave little to chance. Cup after cup top teams qualify. But when one loss throws a team out of competition the system is flawed. Furthermore, in low scoring games (as most Cup games have been beyond the first round), one goal may be decisive. Round-robin (all-play-all) tournaments leave less to chance. However, they may be impractical.